Issues with mobility and autodiscovery with Lync 2013 and IIS/ARR

Hi all,
this is my last resort after days and days searching a solution for this problem... unsuccessfully.
All works fine unless the autodiscovery service with external users and the mobility service for both internal and external ones.
I deployed a Standard Edition Lync Server 2013 with:
a consolidated Frontend server in LAN
an Archiving and Monitoring server in LAN
an Edge server in DMZ with 2 NICs (one in DMZ network and one in LAN)
a IIS/ARR 2.5 reverse proxy in DMZ with 2 NICs (one in DMZ network and one in LAN)
All these roles are on Windows Server 2012 R2.
No split-DNS is deployed since I have different domains for internal and external. In any case I used the pinpoint DNS tip to resolve some records internally (I followed this guide http://tsoorad.blogspot.ch/2012/10/lync-server-dns-pinpoint-zones.html)
Here DNS records into internal domain:
A-record for meet.domain-ext.com points to Frontend server local IP
A-record for dialin.domain-ext.com points to Frontend server local IP
A-record for lyncdiscoverinternal.domain-ext.com points to Frontend server IP
A-record for lyncwebexternal.domain-ext.com points to Frontend sever local IP
A-record for autodiscover.domain-ext.com points to Exchange server local IP
Here DNS records into external domain:
CNAME-record for lyncdiscover.domain-ext.com points to lyncwebexternal.domain-ext.com
CNAME-record for sipexternal.domain-ext.com points to lyncwebexternal.domain-ext.com
A-record for meet.domain-ext.com points to Reverse Proxy public IP
A-record for dialin.domain-ext.com points to Reverse Proxy public IP
A-record for lyncwebexternal.domain-ext.com points to Reverse Proxy public IP
I installed and configured IIS/ARR 2.5 with KB2732764 and KB2785586 on Reverse Proxy following the NextHop guide. The local IP address of external NIC on Reverse Proxy is NATTED by a Cisco ASA firewall with public IP address and only 80/443
ports are permitted.
The problems occurs when I try to connect whit my Lync 2013 APP on iPad using autodiscovery service, both internally and externally. After some seconds the APP shows the message “Cannot connect to the server because it could be busy or
temporarily unavailable. Retry.” When I used the IIS/ARR 3.0 the problem looked like an authentication issue, then I came back to ISS/ARR 2.5 version with its KB. Now I cannot understand what is the cause about logfail.
The same behavior occurs with Android Lync 2013 APP and Windows Phone 8 APP.
Moreover my Lync 2013 client on Windows 7 can connect internally with autodiscovery settings but it cannot do it externally.
I'm a bit confused because I cannot understand if the problem is about external webservice of Frontend server or about Reverse Proxy configuration or about Lync Control Panel configuration.
Here is an extracted of iPad Lync 2013 log (sorry if it’s a bit long).
Any helps are very appreciated, thansk a lot!
</SentRequest>
2013-12-20
11:33:00.781 Lync[563:3a71018c] INFO APPLICATION
CUrlRedirectAndTrustResolver.cpp/201:CUrlRedirectAndTrustResolver::processUrl
called with url = http://lyncdiscover.domain-ext.com/, hopCount = 0, maxHops =
10
2013-12-20
11:33:00.781 Lync[563:6d00000] INFO UTILITIES
CHttpStreamPool.cpp/409:Allocating stream 0x11cbe40 for url -
https://lyncdiscover.domain-ext.com/ with persistent id as 6
2013-12-20
11:33:00.782 Lync[563:3a71018c] INFO TRANSPORT CTransportThread.cpp/131:Added
Request(UcwaAutoDiscoveryRequest) to Request Processor queue
2013-12-20
11:33:00.782 Lync[563:6d00000] VERBOSE TRANSPORT
CHttpProxyHelper.cpp/436:CHttpProxyHelper::discoverProxy : No proxy found for
url https://lyncdiscover.domain-ext.com/?sipuri=sip:[email protected].
Sending over direct connection.
2013-12-20
11:33:00.782 Lync[563:3a71018c] INFO APPLICATION
CTransportRequestRetrialQueue.cpp/385:Submitting new req.
UrlTrustResolver(0x1201358)
2013-12-20
11:33:00.782 Lync[563:3a71018c] INFO APPLICATION
CUcwaAutoDiscoveryService.cpp/1783:Successfully started the GetUserUrlOperation
request for http://lyncdiscover.domain-ext.com/?sipuri=sip:[email protected]
2013-12-20
11:33:00.796 Lync[563:6d00000] INFO TRANSPORT CTransportThread.cpp/343:Sent
Request(UcwaAutoDiscoveryRequest) to Request Processor
2013-12-20
11:33:00.796 Lync[563:6d00000] WARNING TRANSPORT
CCredentialManager.cpp/317:CCredentialManager::getSpecificCredential returning
NULL credential for serviceId (4) type (1)!
2013-12-20
11:33:00.797 Lync[563:6d00000] INFO TRANSPORT
TransportUtilityFunctions.cpp/631:<SentRequest>
GET
http://lyncdiscover.domain-ext.com/
Request Id:
0x1201358
HttpHeader:Accept
application/vnd.microsoft.rtc.autodiscover+xml;v=1
</SentRequest>
2013-12-20
11:33:00.797 Lync[563:6d00000] INFO UTILITIES
CHttpStreamPool.cpp/409:Allocating stream 0x12028f0 for url -
http://lyncdiscover.domain-ext.com/ with persistent id as 7
2013-12-20
11:33:00.798 Lync[563:6d00000] VERBOSE TRANSPORT
CHttpProxyHelper.cpp/436:CHttpProxyHelper::discoverProxy : No proxy found for
url http://lyncdiscover.domain-ext.com/. Sending over direct connection.
2013-12-20
11:33:00.798 Lync[563:6d00000] INFO TRANSPORT CHttpStreamPool.cpp/556:Not
setting TLS as the url(http://lyncdiscover.domain-ext.com/) is not https
2013-12-20
11:33:00.812 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:33:00.812 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:33:00.812 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:33:00.813 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:33:00.813 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:33:04.104 Lync[563:6d00000] INFO UTILITIES CHttpConnection.cpp/577:Received
kCFStreamEventEndEncountered (UcwaAutoDiscoveryRequest)isHeadersAvailable =
true  responseHeadersHandle = 12c5d70
2013-12-20
11:33:04.105 Lync[563:6d00000] INFO UTILITIES CHttpConnection.cpp/628:Response
status = 200 for request UcwaAutoDiscoveryRequest
2013-12-20
11:33:04.105 Lync[563:6d00000] INFO UTILITIES
CHttpStreamPool.cpp/455:Scheduling stream 0x12028f0 for release.
2013-12-20
11:33:04.105 Lync[563:6d00000] INFO TRANSPORT
CHttpRequestProcessor.cpp/173:Received response of
request(UcwaAutoDiscoveryRequest) with status = 0x0
2013-12-20
11:33:04.106 Lync[563:6d00000] INFO TRANSPORT
TransportUtilityFunctions.cpp/925:<ReceivedResponse>
GET
http://lyncdiscover.domain-ext.com/
Request Id:
0x1201358
HttpHeader:Cache-Control
no-cache
HttpHeader:Content-Length
1076
HttpHeader:Content-Type
application/vnd.microsoft.rtc.autodiscover+xml; v=1
HttpHeader:Date
Fri, 20 Dec 2013 10:33:02 GMT
HttpHeader:Expires
-1
HttpHeader:Pragma
no-cache
HttpHeader:Server
Microsoft-IIS/8.5
HttpHeader:StatusCode
200
HttpHeader:X-AspNet-Version
4.0.30319
HttpHeader:X-Content-Type-Options
nosniff
HttpHeader:X-MS-Server-Fqdn
frontend-lync.domain-int.com
HttpHeader:X-Powered-By
ASP.NET, ARR/2.5
Ôªø<?xml
version="1.0" encoding="utf-8"?><AutodiscoverResponse
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
AccessLocation="Internal"><Root><Link
token="Domain" href="https://frontend-lync.domain-int.com/Autodiscover/AutodiscoverService.svc/root/domain?originalDomain=domain-ext.com"
/><Link token="User" href="https://frontend-lync.domain-int.com/Autodiscover/AutodiscoverService.svc/root/user?originalDomain=domain-ext.com"
/><Link token="Self" href="https://frontend-lync.domain-int.com/Autodiscover/AutodiscoverService.svc/root?originalDomain=domain-ext.com"
/><Link token="OAuth" href="https://frontend-lync.domain-int.com/Autodiscover/AutodiscoverService.svc/root/oauth/user?originalDomain=domain-ext.com"
/><Link token="External/XFrame"
href="https://lyncwebexternal.domain-ext.com/Autodiscover/XFrame/XFrame.html"
/><Link token="Internal/XFrame" href="https://frontend-lync.domain-int.com/Autodiscover/XFrame/XFrame.html"
/><Link token="XFrame" href="https://lyncwebexternal.domain-ext.com/Autodiscover/XFrame/XFrame.html"
/></Root></AutodiscoverResponse>
</ReceivedResponse>
2013-12-20
11:33:04.108 Lync[563:6d00000] INFO TRANSPORT
CUcwaAutoDiscoveryResponse.cpp/112:location value is internal
2013-12-20
11:33:04.108 Lync[563:6d00000] INFO TRANSPORT
CUcwaAutoDiscoveryResponse.cpp/195:User url is https://frontend-lync.domain-int.com/autodiscover/autodiscoverservice.svc/root/user?originaldomain=domain-ext.com
2013-12-20
11:33:04.109 Lync[563:6d00000] INFO TRANSPORT
CHttpRequestProcessor.cpp/266:Sending event to main thread for
request(0x1201358)
2013-12-20
11:33:04.109 Lync[563:3a71018c] INFO APPLICATION
CTransportRequestRetrialQueue.cpp/822:Req. completed, Stopping timer.
2013-12-20
11:33:04.109 Lync[563:3a71018c] INFO APPLICATION
CUrlRedirectAndTrustResolver.cpp/610:UrlRedirectAndTrustResolver complete with
url = http://lyncdiscover.domain-ext.com/, Hops = 1, status = S_OK (S0-0-0)
2013-12-20
11:33:04.109 Lync[563:3a71018c] INFO APPLICATION
CTransportRequestRetrialQueue.cpp/725:Response received for req.
UrlTrustResolver(0x1201358): S_OK (S0-0-0) (Success); Done with req.; Stopping
resend timer
2013-12-20
11:33:04.110 Lync[563:3a71018c] INFO APPLICATION
CUcwaAutoDiscoveryGetUserUrlOperation.cpp/393:CUcwaAutoDiscoverGetUserUrlOperation::onEvent
received.  Status = S_OK (S0-0-0), url =
http://lyncdiscover.domain-ext.com/
2013-12-20
11:33:04.110 Lync[563:3a71018c] INFO APPLICATION
CUcwaAutoDiscoveryGetUserUrlOperation.cpp/449:Received a root response
2013-12-20
11:33:04.110 Lync[563:3a71018c] INFO APPLICATION
CUcwaAutoDiscoveryGetUserUrlOperation.cpp/456:Running trust check on user url.
url = https://frontend-lync.domain-int.com/autodiscover/autodiscoverservice.svc/root/user?originaldomain=domain-ext.com
2013-12-20
11:33:04.110 Lync[563:3a71018c] INFO APPLICATION
CUrlRedirectAndTrustResolver.cpp/77:Starting CUrlRedirectAndTrustResolver with
url = https://frontend-lync.domain-int.com/autodiscover/autodiscoverservice.svc/root/user?originaldomain=domain-ext.com,
maxHops = 1
2013-12-20
11:33:04.110 Lync[563:3a71018c] INFO APPLICATION
CUrlRedirectAndTrustResolver.cpp/201:CUrlRedirectAndTrustResolver::processUrl
called with url = https://frontend-lync.domain-int.com/autodiscover/autodiscoverservice.svc/root/user,
hopCount = 0, maxHops = 1
2013-12-20
11:33:04.111 Lync[563:3a71018c] INFO TRANSPORT CTransportThread.cpp/131:Added
Request(UcwaAutoDiscoveryRequest) to Request Processor queue
2013-12-20
11:33:04.111 Lync[563:3a71018c] INFO APPLICATION
CTransportRequestRetrialQueue.cpp/385:Submitting new req.
UrlTrustResolver(0x11d4d38)
2013-12-20
11:33:04.111 Lync[563:6d00000] INFO TRANSPORT CTransportThread.cpp/343:Sent
Request(UcwaAutoDiscoveryRequest) to Request Processor
2013-12-20
11:33:04.111 Lync[563:6d00000] WARNING TRANSPORT
CCredentialManager.cpp/317:CCredentialManager::getSpecificCredential returning
NULL credential for serviceId (4) type (1)!
2013-12-20
11:33:04.112 Lync[563:6d00000] INFO TRANSPORT
TransportUtilityFunctions.cpp/631:<SentRequest>
GET
https://frontend-lync.domain-int.com/autodiscover/autodiscoverservice.svc/root/user
Request Id:
0x11d4d38
HttpHeader:Accept
application/vnd.microsoft.rtc.autodiscover+xml;v=1
</SentRequest>
2013-12-20
11:33:04.112 Lync[563:6d00000] INFO UTILITIES
CHttpStreamPool.cpp/409:Allocating stream 0x125fa90 for url - https://frontend-lync.domain-int.com/autodiscover/autodiscoverservice.svc/root/user
with persistent id as 7
2013-12-20
11:33:04.112 Lync[563:6d00000] VERBOSE TRANSPORT
CHttpProxyHelper.cpp/436:CHttpProxyHelper::discoverProxy : No proxy found for
url https://frontend-lync.domain-int.com/autodiscover/autodiscoverservice.svc/root/user.
Sending over direct connection.
2013-12-20
11:33:04.113 Lync[563:6d00000] INFO UTILITIES CHttpStreamPool.cpp/609:Releasing
stream 0x12028f0.
2013-12-20
11:33:04.261 Lync[563:6d00000] INFO UTILITIES CHttpConnection.cpp/577:Received
kCFStreamEventEndEncountered (UcwaAutoDiscoveryRequest)isHeadersAvailable =
true  responseHeadersHandle = 11cfbd0
2013-12-20
11:33:04.262 Lync[563:6d00000] INFO UTILITIES CHttpConnection.cpp/628:Response
status = 200 for request UcwaAutoDiscoveryRequest
2013-12-20
11:33:04.262 Lync[563:6d00000] INFO UTILITIES
CHttpStreamPool.cpp/455:Scheduling stream 0x11cbe40 for release.
2013-12-20
11:33:04.263 Lync[563:6d00000] INFO TRANSPORT
CHttpRequestProcessor.cpp/173:Received response of
request(UcwaAutoDiscoveryRequest) with status = 0x0
2013-12-20
11:33:04.263 Lync[563:6d00000] INFO TRANSPORT
TransportUtilityFunctions.cpp/925:<ReceivedResponse>
GET
https://lyncdiscover.domain-ext.com/?sipuri=sip:[email protected]
Request Id:
0x12450d8
HttpHeader:Cache-Control
no-cache
HttpHeader:Content-Length
1076
HttpHeader:Content-Type
application/vnd.microsoft.rtc.autodiscover+xml; v=1
HttpHeader:Date
Fri, 20 Dec 2013 10:33:02 GMT
HttpHeader:Expires
-1
HttpHeader:Pragma
no-cache
HttpHeader:Server
Microsoft-IIS/8.5
HttpHeader:StatusCode
200
HttpHeader:X-AspNet-Version
4.0.30319
HttpHeader:X-Content-Type-Options
nosniff
HttpHeader:X-MS-Server-Fqdn
frontend-lync.domain-int.com
HttpHeader:X-Powered-By
ASP.NET, ARR/2.5
Ôªø<?xml
version="1.0" encoding="utf-8"?><AutodiscoverResponse
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
AccessLocation="Internal"><Root><Link
token="Domain" href="https://frontend-lync.domain-int.com/Autodiscover/AutodiscoverService.svc/root/domain?originalDomain=domain-ext.com"
/><Link token="User" href="https://frontend-lync.domain-int.com/Autodiscover/AutodiscoverService.svc/root/user?originalDomain=domain-ext.com"
/><Link token="Self" href="https://frontend-lync.domain-int.com/Autodiscover/AutodiscoverService.svc/root?originalDomain=domain-ext.com"
/><Link token="OAuth" href="https://frontend-lync.domain-int.com/Autodiscover/AutodiscoverService.svc/root/oauth/user?originalDomain=domain-ext.com"
/><Link token="External/XFrame"
href="https://lyncwebexternal.domain-ext.com/Autodiscover/XFrame/XFrame.html"
/><Link token="Internal/XFrame" href="https://frontend-lync.domain-int.com/Autodiscover/XFrame/XFrame.html"
/><Link token="XFrame" href="https://lyncwebexternal.domain-ext.com/Autodiscover/XFrame/XFrame.html"
/></Root></AutodiscoverResponse>
</ReceivedResponse>
2013-12-20
11:33:04.264 Lync[563:6d00000] INFO TRANSPORT
CUcwaAutoDiscoveryResponse.cpp/112:location value is internal
2013-12-20
11:33:04.265 Lync[563:6d00000] INFO TRANSPORT
CUcwaAutoDiscoveryResponse.cpp/195:User url is https://frontend-lync.domain-int.com/autodiscover/autodiscoverservice.svc/root/user?originaldomain=domain-ext.com
2013-12-20
11:33:04.265 Lync[563:6d00000] INFO TRANSPORT
CHttpRequestProcessor.cpp/266:Sending event to main thread for
request(0x12450d8)
2013-12-20
11:33:04.266 Lync[563:3a71018c] INFO APPLICATION CTransportRequestRetrialQueue.cpp/822:Req.
completed, Stopping timer.
2013-12-20
11:33:04.266 Lync[563:3a71018c] INFO APPLICATION
CUcwaAutoDiscoveryGetUserUrlOperation.cpp/290:Received a root response
2013-12-20
11:33:04.266 Lync[563:3a71018c] INFO APPLICATION CUcwaAutoDiscoveryGetUserUrlOperation.cpp/224:UcwaAutoDiscoveryGetUserUrlOperation
completed with url = https://lyncdiscover.domain-ext.com/?sipuri=sip:[email protected],
userUrl = https://frontend-lync.domain-int.com/autodiscover/autodiscoverservice.svc/root/user?originaldomain=domain-ext.com,
status = S_OK (S0-0-0)
2013-12-20
11:33:04.266 Lync[563:3a71018c] INFO APPLICATION
CTransportRequestRetrialQueue.cpp/725:Response received for req.
GET-UnAuthenticatedGet(0x12450d8): S_OK (S0-0-0) (Success); Done with req.; Stopping
resend timer
2013-12-20
11:33:04.267 Lync[563:3a71018c] INFO APPLICATION
CTransportRequestRetrialQueue.cpp/399:Cancelling all requests
2013-12-20
11:33:04.267 Lync[563:3a71018c] INFO APPLICATION
CTransportRequestRetrialQueue.cpp/409:Cancelling request: 0x11d4d38
2013-12-20
11:33:04.267 Lync[563:3a71018c] INFO TRANSPORT CSessionBase.hxx/158:Cancelling
request: 0x11d4d38
2013-12-20
11:33:04.267 Lync[563:3a71018c] INFO TRANSPORT CTransportThread.cpp/163:Added
Request(UcwaAutoDiscoveryRequest) to Request Processor queue
2013-12-20
11:33:04.267 Lync[563:3a71018c] INFO APPLICATION
CUrlRedirectAndTrustResolver.cpp/610:UrlRedirectAndTrustResolver complete with
url = https://frontend-lync.domain-int.com/autodiscover/autodiscoverservice.svc/root/user,
Hops = 1, status = W_Cancelled (W0-0-6)
2013-12-20
11:33:04.267 Lync[563:3a71018c] INFO APPLICATION
CUcwaAutoDiscoveryGetUserUrlOperation.cpp/224:UcwaAutoDiscoveryGetUserUrlOperation
completed with url = http://lyncdiscover.domain-ext.com/?sipuri=sip:[email protected],
userUrl = , status = W_Cancelled (W0-0-6)
2013-12-20
11:33:04.268 Lync[563:6d00000] INFO TRANSPORT CTransportThread.cpp/343:Sent
Request(UcwaAutoDiscoveryRequest) to Request Processor
2013-12-20
11:33:04.268 Lync[563:3a71018c] INFO TRANSPORT CCredentialManager.cpp/176:getSpecificCredential
for serviceId(1) returning: credType (1) signInName ([email protected])
domain () username (mattia.spagnoli) password.empty() (0) certificate.isValid()
(0) privateKey.empty() (1) compatibleServiceIds(1)
2013-12-20
11:33:04.268 Lync[563:3a71018c] INFO TRANSPORT
CMetaDataManager.cpp/403:Received a request to get the meta data of type 0 for
url https://frontend-lync.domain-int.com/autodiscover/autodiscoverservice.svc/root/user?originaldomain=domain-ext.com
2013-12-20
11:33:04.269 Lync[563:3a71018c] INFO TRANSPORT CMetaDataManager.cpp/467:Sending
Unauthenticated get to get the web-ticket url
2013-12-20
11:33:04.269 Lync[563:3a71018c] INFO TRANSPORT CTransportThread.cpp/131:Added
Request() to Request Processor queue
2013-12-20
11:33:04.269 Lync[563:3a71018c] INFO TRANSPORT
CAuthenticationResolver.cpp/109:Waiting on Meta Data from https://frontend-lync.domain-int.com/autodiscover/autodiscoverservice.svc/root/user?originaldomain=domain-ext.com
2013-12-20
11:33:04.269 Lync[563:62d4000] INFO TRANSPORT CTransportThread.cpp/343:Sent
Request() to Request Processor
2013-12-20
11:33:04.270 Lync[563:3a71018c] INFO APPLICATION
CTransportRequestRetrialQueue.cpp/385:Submitting new req.
GET-AuthenticatedUserGetRequest(0x1201ab8)
2013-12-20
11:33:04.270 Lync[563:62d4000] WARNING TRANSPORT
CCredentialManager.cpp/317:CCredentialManager::getSpecificCredential returning
NULL credential for serviceId (4) type (1)!
2013-12-20
11:33:04.270 Lync[563:3a71018c] INFO APPLICATION
CUcwaAutoDiscoveryService.cpp/1189:Submitting Authenticated AutoDiscovery
request to https://frontend-lync.domain-int.com/autodiscover/autodiscoverservice.svc/root/user?originaldomain=domain-ext.com
2013-12-20
11:33:04.270 Lync[563:6d00000] INFO UTILITIES
CHttpStreamPool.cpp/455:Scheduling stream 0x125fa90 for release.
2013-12-20
11:33:04.271 Lync[563:62d4000] INFO TRANSPORT
TransportUtilityFunctions.cpp/631:<SentRequest>
GET
https://frontend-lync.domain-int.com/autodiscover/autodiscoverservice.svc/root/user?originaldomain=domain-ext.com
Request Id:
0x1206198
HttpHeader:Accept
HttpHeader:X-MS-WebTicket
xxxxxxxxxx
</SentRequest>
2013-12-20
11:33:04.271 Lync[563:3a71018c] INFO APPLICATION
CUcwaAutoDiscoveryService.cpp/1662:Ignoring GetUserUrlOperation event as
current state is 6
2013-12-20
11:33:04.271 Lync[563:62d4000] INFO UTILITIES
CHttpStreamPool.cpp/409:Allocating stream 0x11c0a40 for url - https://frontend-lync.domain-int.com/autodiscover/autodiscoverservice.svc/root/user
with persistent id as 15
2013-12-20
11:33:04.271 Lync[563:3a71018c] INFO APPLICATION CUcwaAutoDiscoveryService.cpp/1664:Request
url was http://lyncdiscover.domain-ext.com/?sipuri=sip:[email protected]
2013-12-20
11:33:04.272 Lync[563:62d4000] VERBOSE TRANSPORT
CHttpProxyHelper.cpp/436:CHttpProxyHelper::discoverProxy : No proxy found for
url https://frontend-lync.domain-int.com/autodiscover/autodiscoverservice.svc/root/user?originaldomain=domain-ext.com.
Sending over direct connection.
2013-12-20
11:33:20.621 Lync[563:3a71018c] INFO UTILITIES
CNetworkMonitor.cpp/217:Reachabilility Flags IsWWAN(0):Reachable(0):TransientConnection(0):ConnectionRequired(0):ConnectionOnTraffic(0):InterventionRequired(0):ConnectionOnDemand(0):IsLocalAddress(0):IsDirect(0)
2013-12-20
11:33:20.623 Lync[563:3a71018c] INFO UTILITIES CNetworkMonitor.cpp/186:Updated
networkAvailableToConnect(CellularDataNetwork) -> NoNetwork,
isInAirplaneMode(0) -> 1
2013-12-20
11:33:20.623 Lync[563:3a71018c] INFO APPLICATION
CUcmpConversationsManager.cpp/4091:CUcmpConversationsManager::canDoVideoBasedOnNetworkAndPolicy
returns false because RequestWiFiForAudio or RequestWifiForVideo is true and
current network : is not WiFi
2013-12-20
11:33:20.623 Lync[563:3a71018c] INFO APPLICATION
CUcmpConversationsManager.cpp/1672:CUcmpConversationsManager::queryCapability
on StartP2PVideoCall returns false because
canDoVideoBasedOnNetworkAndPolicy 
returned false
2013-12-20
11:33:20.904 Lync[563:3a71018c] INFO UTILITIES
CNetworkMonitor.cpp/217:Reachabilility Flags
IsWWAN(1):Reachable(1):TransientConnection(1):ConnectionRequired(0):ConnectionOnTraffic(0):InterventionRequired(0):ConnectionOnDemand(0):IsLocalAddress(1):IsDirect(0)
2013-12-20
11:33:20.905 Lync[563:3a71018c] INFO UTILITIES CNetworkMonitor.cpp/186:Updated
networkAvailableToConnect(NoNetwork) -> CellularDataNetwork,
isInAirplaneMode(1) -> 0
2013-12-20
11:33:20.905 Lync[563:3a71018c] INFO TRANSPORT CEventChannelManager.cpp/826:Received
network monitor event so restarting event channel.
2013-12-20
11:33:20.906 Lync[563:3a71018c] INFO TRANSPORT
CEventChannelManager.cpp/520:Moving the event channel aggressive mode.
2013-12-20
11:33:20.906 Lync[563:3a71018c] INFO APPLICATION
CUcmpConversationsManager.cpp/4091:CUcmpConversationsManager::canDoVideoBasedOnNetworkAndPolicy
returns false because RequestWiFiForAudio or RequestWifiForVideo is true and
current network : is not WiFi
2013-12-20
11:33:20.906 Lync[563:3a71018c] INFO APPLICATION
CUcmpConversationsManager.cpp/1672:CUcmpConversationsManager::queryCapability
on StartP2PVideoCall returns false because
canDoVideoBasedOnNetworkAndPolicy 
returned false
2013-12-20
11:33:20.906 Lync[563:3a71018c] INFO APPLICATION CUcwaAutoDiscoveryService.cpp/2070:adIsEnabled
= 1, sipUri = sip:[email protected], m_internalADUrlInput =
m_externalADUrlInput =
2013-12-20
11:33:20.906 Lync[563:3a71018c] INFO APPLICATION
CUcwaAutoDiscoveryService.cpp/255:Discovery is in progress and process state is
6Ignoring request to start network discovery
2013-12-20
11:34:04.274 Lync[563:62d4000] INFO UTILITIES
CHttpStreamPool.cpp/455:Scheduling stream 0x11c0a40 for release.
2013-12-20
11:34:04.275 Lync[563:62d4000] ERROR UTILITIES CHttpConnection.cpp/517:Connection
timedout for request (0x%u0x12d1ea0) - notifying error E_ConnectionTimeoutError
2013-12-20
11:34:04.275 Lync[563:62d4000] INFO TRANSPORT
CHttpRequestProcessor.cpp/173:Received response of request() with status =
0x22020005
2013-12-20
11:34:04.276 Lync[563:62d4000] INFO TRANSPORT
CHttpRequestProcessor.cpp/201:Request 
resulted in E_ConnectionTimeoutError (E2-2-5). The retry counter is: 0
2013-12-20
11:34:04.276 Lync[563:62d4000] INFO TRANSPORT
CHttpRequestProcessor.cpp/266:Sending event to main thread for
request(0x1206198)
2013-12-20
11:34:04.277 Lync[563:3a71018c] INFO TRANSPORT
CMetaDataManager.cpp/581:Received response for meta data request of type 60
with status 570556421
2013-12-20
11:34:04.277 Lync[563:3a71018c] ERROR TRANSPORT CMetaDataManager.cpp/597:Unable
to get a response to an unauthenticated get to url https://frontend-lync.domain-int.com/autodiscover/autodiscoverservice.svc/root/user?originaldomain=domain-ext.com
2013-12-20
11:34:04.278 Lync[563:3a71018c] INFO TRANSPORT CAuthenticationResolver.cpp/210:MetaData
retrieval for url https://frontend-lync.domain-int.com/autodiscover/autodiscoverservice.svc/root/user?originaldomain=domain-ext.com
completed with status 570556421
2013-12-20
11:34:04.278 Lync[563:3a71018c] INFO TRANSPORT CAuthenticationResolver.cpp/239:Deleting
1 pended Meta data requests for url https://frontend-lync.domain-int.com/autodiscover/autodiscoverservice.svc/root/user?originaldomain=domain-ext.com
2013-12-20
11:34:04.278 Lync[563:3a71018c] ERROR TRANSPORT CAuthenticationResolver.cpp/288:Unable
to get the meta data for server url https://frontend-lync.domain-int.com/autodiscover/autodiscoverservice.svc/root/user?originaldomain=domain-ext.com
2013-12-20
11:34:04.279 Lync[563:3a71018c] INFO TRANSPORT
CAuthenticationResolver.cpp/293:Failing request to the request manager
2013-12-20
11:34:04.279 Lync[563:3a71018c] INFO TRANSPORT CRequestManager.cpp/273:Failing
secure request UcwaAutoDiscoveryRequest with status E_ConnectionTimeoutError
(E2-2-5)
2013-12-20
11:34:04.279 Lync[563:3a71018c] INFO APPLICATION
CTransportRequestRetrialQueue.cpp/822:Req. completed, Stopping timer.
2013-12-20
11:34:04.279 Lync[563:3a71018c] INFO APPLICATION
CUcwaAutoDiscoveryService.cpp/1284:Received autodiscovery response with status
E_ConnectionTimeoutError (E2-2-5)
2013-12-20
11:34:04.279 Lync[563:3a71018c] INFO APPLICATION
CUcwaAutoDiscoveryService.cpp/1242:Raising Autodiscovery event with status
E_ConnectionTimeoutError (E2-2-5) for eventType 0
2013-12-20
11:34:04.280 Lync[563:3a71018c] INFO APPLICATION CUcwaAutoDiscoveryServiceRetrialWrapper.cpp/417:Received
event for type 0 with status E_ConnectionTimeoutError (E2-2-5)
2013-12-20
11:34:04.280 Lync[563:3a71018c] INFO APPLICATION
CUcwaAutoDiscoveryServiceRetrialWrapper.cpp/496:Raising Autodiscovery event
with status E_ConnectionTimeoutError (E2-2-5) for eventType 0
2013-12-20
11:34:04.280 Lync[563:3a71018c] ERROR APPLICATION
CUcwaAppSession.cpp/2066:Auto-discovery failed, aborting sign-in!
2013-12-20
11:34:04.280 Lync[563:3a71018c] INFO APPLICATION CUcwaAppSession.cpp/998:CUcwaAppSession::setNewActualState()
state=0
2013-12-20
11:34:04.294 Lync[563:3a71018c] INFO UTILITIES
CBasePersistableComponent.cpp/230:Storing 7 out-of-sync components took 10ms
2013-12-20
11:34:04.295 Lync[563:3a71018c] INFO UTILITIES CiOsAppStateQuery.h/147:Clearing
keep-alive timer callback
2013-12-20
11:34:04.295 Lync[563:6d00000] INFO TRANSPORT
CHttpRequestProcessor.cpp/134:Clearing request processor for component
UcwaAutoDiscoverySession on sign-out.
2013-12-20
11:34:04.295 Lync[563:62d4000] INFO TRANSPORT
CHttpRequestProcessor.cpp/134:Clearing request processor for component
MetaDataManager on sign-out.
2013-12-20
11:34:04.295 Lync[563:3a71018c] INFO APPLICATION CAlertReporter.cpp/64:Alert
received! Category 1, Type 201, level 0, error E_ConnectionTimeoutError
(E2-2-5), context '', hasAction=false
2013-12-20
11:34:04.296 Lync[563:6d00000] INFO UTILITIES CHttpStreamPool.cpp/609:Releasing
stream 0x11cbe40.
2013-12-20
11:34:04.296 Lync[563:62d4000] INFO UTILITIES CHttpStreamPool.cpp/609:Releasing
stream 0x11c0a40.
2013-12-20
11:34:04.296 Lync[563:3a71018c] INFO APPLICATION CAlertReporter.cpp/117:Alert
cleared of Category 1, Type 201, cleared 0 alerts
2013-12-20
11:34:04.297 Lync[563:3a71018c] INFO APPLICATION
CTransportRequestRetrialQueue.cpp/725:Response received for req.
GET-AuthenticatedUserGetRequest(0x1201ab8): E_ConnectionTimeoutError (E2-2-5)
(RemoteNetworkTemporaryError); Done with req.; Stopping resend timer
2013-12-20
11:34:04.298 Lync[563:3a71018c] INFO UI CMAudioUtil.mm/322:stopSound
2013-12-20
11:34:04.298 Lync[563:3a71018c] INFO UI CMAudioUtil.mm/322:stopSound
2013-12-20
11:34:04.298 Lync[563:3a71018c] INFO UI CMAudioUtil.mm/322:stopSound
2013-12-20
11:34:04.298 Lync[563:3a71018c] INFO UI CMAudioVideoToastViewController.mm/992:Cancelling
local notification
2013-12-20
11:34:04.299 Lync[563:6d00000] INFO UTILITIES CHttpStreamPool.cpp/609:Releasing
stream 0x125fa90.
2013-12-20
11:34:04.300 Lync[563:3a71018c] INFO UI CMRootViewController.mm/378:ActualState
= 0 DesiredState = 2  DataAvailable = 0
2013-12-20
11:34:04.300 Lync[563:3a71018c] INFO UI
CMDetailViewController.mm/229:ActualState = 0 DesiredState = 1  DataAvailable = 0
2013-12-20
11:34:04.300 Lync[563:3a71018c] INFO UI CMDetailViewController.mm/262:ActualState
= IsSignedOut DesiredState = BeSignedIn DataAvailable = 0 Showing UI =
CredentialTableViewController
2013-12-20
11:34:04.300 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:34:04.301 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:34:04.301 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:34:04.301 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:34:04.301 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:34:04.301 Lync[563:3a71018c] INFO UI CMNotificationManager.mm/705:desired
view is alert, size 1
2013-12-20
11:34:04.301 Lync[563:3a71018c] INFO UI CMNotificationManager.mm/745:adding the
desired view
2013-12-20
11:34:04.302 Lync[563:3a71018c] INFO UI CMNotificationManager.mm/480:reposition
floating views
2013-12-20
11:34:04.302 Lync[563:3a71018c] INFO UI CMAlertViewController.mm/110:showalert
is 1
2013-12-20
11:34:04.302 Lync[563:3a71018c] INFO UI CMAlertViewController.mm/114:showalert
is 0
2013-12-20
11:34:04.302 Lync[563:3a71018c] INFO UI CMUIUtil.mm/402:Mapping error code =
0x22020005, context = , type = 201
2013-12-20 11:34:04.303 Lync[563:3a71018c] INFO UI
CMUIUtil.mm/1680:Mapped error message is 'Non riesco a connettermi al server
perché potrebbe essere occupato o temporaneamente non disponibile. Riprova.
2013-12-20
11:34:04.304 Lync[563:3a71018c] ERROR UI
CMDismissButtonBaseViewController.mm/89:before: view height 1024.000000, width
45.000000, x 64.000000, y 0.000000
2013-12-20
11:34:04.304 Lync[563:3a71018c] INFO UI
CMNotificationManager.mm/1089:viewFrame: origin x 64.000000, origin y 0.000000,
height 1024.000000, width 45.000000
2013-12-20
11:34:04.304 Lync[563:3a71018c] INFO UI CMNotificationManager.mm/1195:resize
alert label, origin x 44.000000, origin y 2.000000, height 41.000000, width
936.000000
2013-12-20
11:34:04.305 Lync[563:3a71018c] ERROR UI CMDismissButtonBaseViewController.mm/104:after:
self.label.frame height 41.000000, width 936.000000, x 44.000000, y 2.000000
2013-12-20
11:34:04.305 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:34:04.305 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:34:04.305 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:34:04.305 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:34:04.305 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:34:04.306 Lync[563:3a71018c] INFO UI CMNotificationManager.mm/705:desired
view is alert, size 1
2013-12-20
11:34:04.306 Lync[563:3a71018c] INFO UI CMNotificationManager.mm/718:desired
view is same as the current view
2013-12-20
11:34:04.306 Lync[563:3a71018c] INFO UI CMNotificationManager.mm/480:reposition
floating views
2013-12-20
11:34:04.306 Lync[563:3a71018c] INFO UI CMAlertViewController.mm/110:showalert
is 0
2013-12-20
11:34:04.306 Lync[563:3a71018c] ERROR UI
CMDismissButtonBaseViewController.mm/89:before: view height 1024.000000, width
45.000000, x 64.000000, y 0.000000
2013-12-20
11:34:04.307 Lync[563:3a71018c] INFO UI
CMNotificationManager.mm/1089:viewFrame: origin x 64.000000, origin y 0.000000,
height 1024.000000, width 45.000000
2013-12-20
11:34:04.307 Lync[563:3a71018c] INFO UI CMNotificationManager.mm/1195:resize
alert label, origin x 44.000000, origin y 2.000000, height 41.000000, width
936.000000
2013-12-20
11:34:04.307 Lync[563:3a71018c] ERROR UI
CMDismissButtonBaseViewController.mm/104:after: self.label.frame height
41.000000, width 936.000000, x 44.000000, y 2.000000
2013-12-20
11:34:04.337 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:34:04.337 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:34:04.338 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:34:04.338 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:34:04.338 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:34:04.338 Lync[563:3a71018c] INFO UI CMNotificationManager.mm/705:desired
view is alert, size 1
2013-12-20
11:34:04.338 Lync[563:3a71018c] INFO UI CMNotificationManager.mm/718:desired
view is same as the current view
2013-12-20
11:34:04.338 Lync[563:3a71018c] INFO UI CMNotificationManager.mm/480:reposition
floating views
2013-12-20
11:34:04.339 Lync[563:3a71018c] INFO UI CMAlertViewController.mm/110:showalert is
0
2013-12-20
11:34:04.339 Lync[563:3a71018c] ERROR UI
CMDismissButtonBaseViewController.mm/89:before: view height 1024.000000, width
45.000000, x 64.000000, y 0.000000
2013-12-20
11:34:04.339 Lync[563:3a71018c] INFO UI CMNotificationManager.mm/1089:viewFrame:
origin x 64.000000, origin y 0.000000, height 1024.000000, width 45.000000
2013-12-20
11:34:04.339 Lync[563:3a71018c] INFO UI CMNotificationManager.mm/1195:resize
alert label, origin x 44.000000, origin y 2.000000, height 41.000000, width
936.000000
2013-12-20
11:34:04.339 Lync[563:3a71018c] ERROR UI
CMDismissButtonBaseViewController.mm/104:after: self.label.frame height
41.000000, width 936.000000, x 44.000000, y 2.000000
2013-12-20
11:34:04.340 Lync[563:3a71018c] INFO UI CMSplitViewController.mm/162:Details
Pane is in Full screen with controller
2013-12-20
11:34:04.340 Lync[563:3a71018c] INFO UI CMSplitViewController.mm/204:Split view
frame orientation UIInterfaceOrientationLandscapeLeft Height = 748.000000 Width
= 1024.000000 origin.x = 20.000000 origin.y = 0.000000 keyboardHeight =
0.000000
2013-12-20
11:34:04.341 Lync[563:3a71018c] INFO UI CMSplitViewController.mm/162:Details
Pane is in Full screen with controller
2013-12-20
11:34:04.341 Lync[563:3a71018c] INFO UI CMSplitViewController.mm/204:Split view
frame orientation UIInterfaceOrientationLandscapeLeft Height = 748.000000 Width
= 1024.000000 origin.x = 20.000000 origin.y = 0.000000 keyboardHeight =
0.000000
2013-12-20
11:34:04.343 Lync[563:3a71018c] INFO UI
CMToolsViewController.mm/349:ActualState = 0 DesiredState = 1  DataAvailable = 0
2013-12-20
11:34:04.344 Lync[563:3a71018c] INFO UI
CMAlertViewController.mm/93:ObservableListItem Added event received
2013-12-20
11:34:04.344 Lync[563:3a71018c] INFO UI CMAlertViewController.mm/103:showalert
is 1
2013-12-20
11:34:04.344 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:34:04.344 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:34:04.344 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:34:04.344 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:34:04.345 Lync[563:3a71018c] INFO UI CMConversationCommon.mm/43:not signed
in
2013-12-20
11:34:04.345 Lync[563:3a71018c] INFO UI CMNotificationManager.mm/705:desired
view is alert, size 1
2013-12-20
11:34:04.345 Lync[563:3a71018c] INFO UI CMNotificationManager.mm/718:desired
view is same as the current view
2013-12-20
11:34:04.345 Lync[563:3a71018c] INFO UI CMNotificationManager.mm/480:reposition
floating views
2013-12-20
11:34:04.345 Lync[563:3a71018c] INFO UI CMAlertViewController.mm/110:showalert
is 1
2013-12-20
11:34:04.345 Lync[563:3a71018c] INFO UI CMAlertViewController.mm/114:showalert
is 0
2013-12-20
11:34:04.345 Lync[563:3a71018c] INFO UI CMUIUtil.mm/402:Mapping error code =
0x22020005, context = , type = 201
2013-12-20
11:34:04.346 Lync[563:3a71018c] INFO UI CMUIUtil.mm/1680:Mapped error message
is ‘Cannot connect to the server because it could be busy or temporarily
unavailable. Retry.’

Hi Kent,
thanks a lot for your reply!
I created  _sip._tls.domain-ext.com SRV record in the external DNS and now autodiscovery works fine. At the beginning I had not created it because I thought lyncdiscover.domain-ext.com A record was enough for autodiscovery. I still cannot understand
why lyncdiscover.domain-ext.com points to reverse proxy, while _sip._tls.domain-ext.com points to Edge server. It's strange because both are part of the research order of Lync 2013 desktop clients.
By the way, mobility still does not work. I tried to insert bot the https URLs as manual configuration but Lync 2013 for iPad was not be able to login. I tried to paste both the URLs in the web browser and:
with https://<ExtwebFQDN>/Autodiscover/autodiscoverservice.svc/Root appears the "Root.json" file to be downloaded;
with https://<IntwebFQDN>/AutoDiscover/AutoDiscover.svc/Root
the message "500-Internal error of server" appears.
Any suggests from you about how to check the configuration of ISS/ARR 2.5?
Thanks again!

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