Users lose connection to Exchange.

Hi
I have a Exchange 2007 on Windows 2003 environment with about 9,000 users.
Lately I have been struggling with an issue and I need some help.
Some users lose their connectivity of Outlook to Exchange (outlook appears Offline), even though they have Network connection and normally to solve this, I disconnect the network cable and reconnect it. I just want to clarify if this is a network or Exchange
issue and also, how could I solve this.
Thanks.

1) If unplugging the network cable to the user's computer and plugging it back in again fixes the issue, it is probably not a, server issue.
2) However, to test, can the user access OWA while their Outlook is unable to connect? If so, their mailbox is fine.
3) How are you configuring Outlook to connect - RPC/TCP or RPC/HTTP (OutlookAnywhere)? RPC/TCP will connect directly to the Mailbox server with Exchange 2007 and OutlookAnywhere will connect to the CAS server, so it is important to distinguish which
connection you are troubleshooting.
4) What is common about the group of users who lose connectivity? Same switch? Same Database? Connecting to same CAS (if OutlookAnywhere)?
5) Do some basic network connectivity tests (ping, tracert, nslookup, etc) on the PC when in repro
6) Collect and analyze a netmon capture during the issue.
EDIT:
Also, from a client perspective - take a look at event logs. Also, is AV installed and does the issue occur if you uninstall or disable it temporarily?

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Manju Gowda

Hi
You have to get the "RPC Client Access" log file in your CAS server. There you can see a column called "client-mode" and it has two modes such
as "classic" and "cached". From there you can get the two different client assess modes and their corresponding users.
probably take this file openup on excel and filter to see the two modes
Remember to mark as helpful if you find my contribution useful or as an answer if it does answer your question.That will encourage me - and others - to take time out to help you Check out my latest blog posts on http://exchangequery.com Thanks Sathish
(MVP)

Outlook Mac Loses Connection to Exchange Server

Hi All,
I've had this problem pretty since deployment a couple of weeks ago, so I'm hoping some one can point me in the right direction. I'm running Exchange 2013 on a Server 2012 Standard box with the DC running on a different box, every thing up to date.
Mac clients running Outlook 2011 (14.4.2).
Periodically throughout the day, Outlook loses connection to Exchange server. After several minutes, it will connect back up, and seems to operate normally. During the down time, I am able to connect to OWA, and ActiveSync seems to work as well.
If I run the Remote Connectivity Analyzer while Outlook is responding, I get no errors and the "Connectivity Test Successful" message. However, if I run it while Outlook is NOT responding, I get the following:
Exchange Web Services synchronization, notification, availability, and Automatic Replies.
Not all tests of Exchange Web Services tasks completed.
Creating a temporary folder to perform synchronization tests.
Failed to create temporary folder for performing tests.
Exception details:
Message: The request failed. The operation has timed out
Type: Microsoft.Exchange.WebServices.Data.ServiceRequestException
Stack trace:
at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.GetEwsHttpWebResponse(IEwsHttpWebRequest request)
at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.ValidateAndEmitRequest(IEwsHttpWebRequest& request)
at Microsoft.Exchange.WebServices.Data.MultiResponseServiceRequest`1.Execute()
at Microsoft.Exchange.WebServices.Data.ExchangeService.BindToFolder[TFolder](FolderId folderId, PropertySet propertySet)
at Microsoft.Exchange.Tools.ExRca.Tests.GetOrCreateSyncFolderTest.PerformTestReally()
Exception details:
Message: The operation has timed out
Type: System.Net.WebException
Stack trace:
at System.Net.HttpWebRequest.GetResponse()
at Microsoft.Exchange.WebServices.Data.EwsHttpWebRequest.Microsoft.Exchange.WebServices.Data.IEwsHttpWebRequest.GetResponse()
at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.GetEwsHttpWebResponse(IEwsHttpWebRequest request)
Elapsed Time: 100141 ms.
Nothing I've attempted to do so far as had any meaningful impact, and I am fairly new to Exchange.
Following the adice I've seen online so far, I've:
I've made sure the auto discover in DNS points to the Exchange server.
I've disable auto-discover on the client, manually adding accounts, tried using their FQDN, local IP, LAN IP.
I've made exceptions to the proxie on the client.
Just not sure where to look next? Appreciate any advice out there.
Thanks,
Michael

Hi,
Before we go further, I'd like to confirm if your Outlook clients can work well when your Outlook MAC clients come across the issue.
If the issue only happens on your Outlook MAC clients, we can check the IIS log and confirm if there is any error releted to EWS. And you can recreate your EWS virtual directory to have a test.
Thanks,
Angela Shi
TechNet Community Support

Outlook 2013 randomly loses connection to Exchange 2007 server

Hello everyone,
I have received complaints from some of our users over the past couple of months about them not receiving mails or about sending mails which do not get delivered. A little bit of investigation into the matter showed me that Outlook 2013 had lost its connection
to the Exchange server. (Which is Exchange 2007 SP3 running on Windows Server 2008 / SBS2008, in case it matters.)
Which is bad enough in itself - none of our users running Outlook 2007 and 2010 had that problem - but it also does so in a rather inconspicuous manner, so the users did not notice. Closing and restarting Outlook helped every single time, but the users did
not notice when this happened, and telling them to just restart Outlook every hour or so does not seem like an overloy practical idea.
All of the clients encountering the problem are running Outlook 2013 on Windows 8/8.1 Pro. We do not have any clients running older versions of Outlook on Windows 8, so I cannot tell for sure if this problem originates in the OS or if it is an Outlook problem.
The first couple of times I encountered the problem, it was on laptops, so I suspected some power management issue initially. I made sure Outlook connected to the server via HTTPS, which it already did. Then I did not hear of the problem for about two months,
but recently, two of our users have run into the problem again, and while these were still Windows 8.1 machines, running, of course, Outlook 2013, they are plain desktop computers, not laptops, and I already toned down their power management settings, so I
do not think that it has to do with the problem.
Has anybody encountered a similar problem or even - more importantly - a solution? This problem is really frustrating, because our users are very sensitive to problems with their email, and the fact that this problem only occurs randomly and - all in all
- rather rarely, makes it very hard to track down.
Thank you all very, very much for any insights you might be able to share with me!

Hi,
Please ensure that Outlook 2013 clients retain their connection with the Exchange server using HTTP:
Have the Outlook 2013 user check the settings under FILE -> Account Settings -> Account Settings -> E-mail tab -> Select the account and click Change -> More Settings -> Connection tab -> Exchange Proxy Settings -> Make sure both
"On fast networks, connect using HTTP first, then connect using TCP/IP" and "On slow networks, connect using HTTP first, then connect using TCP/IP" are selected -> OK.
Regards,
Melon Chen
TechNet Community Support
It's recommended to download and install
Configuration Analyzer Tool (OffCAT), which is developed by Microsoft Support teams. Once the tool is installed, you can run it at any time to scan for hundreds of known issues in Office
programs.

User cannot connect to exchange server

I have rounded up all of the usual suspects and am at a loss here. A user has been running in offline mode for a while. The ability to uncheck offline mode is greyed out. Pinged my Exchange server by name to see if resolves from this PC. It does. Renamed
.ost so a new one would be generated. No help. I removed the Outlook profile in Control Panel>mail and tried to create a new one. I get the cannot connect to Exchange error. I tried to log in as him on my PC and have the same results. I do not see any issues
with his account on my Exchange server. Any ideas to check on next? Never had one do this before.
Brian Gilmore Lead IT Technician Don-Nan Pump & Supply

This type of error generally occurs when user had disabled Encryption of data between Microsoft
Office Outlook and Microsoft Exchange profile , and default configuration of Exchange requires RPC encryption from Outlook client , which is not available, so this error is displayed.
To solve this issue you may try any of these solutions below:
1. Disable the encryption requirement on all CAS servers.
2. Try to manually update your Outlook profile with RPC encryption.
3.
Expand Group Policy settings to update existing Outlook profiles with RPC encryption
Hope this will work for you !!!

Outlook loses connection to exchange, pop up for credentials for specific internal users only

2 load balanced CAS/web exchange 2010.
"the connection to microsoft exchange is unavailable. outlook must be online or connected to complete this action"
No one is experiencing this externally, only internally on terminal servers.
Lync 2010 and Outlook 2010.
They get the Lync MAPI conneciton prompt.
Occasionally, after the above outlook error are prompted to enter credentials for exchange logon.
When I go to connection status during this issue, the "outlook.domain.com" URL is "established" for mail, but referral, and 2 directory statuses are "disconnected" or "connecting".
Address book service on 2 front ends are fine and started during this issue.
This is only happening for one department in our environment. Of course, they are the only department that uses Lync internally on terminal servers.
Lync config also says "EWS not deployed"
Other departments testing Lync internally so far, "EWS ok".
No other departments are having outlook issues.
Departments differ from one another by OU and GPO.
Josh

Hi,
According to your description, the issue may be related to your CAS array configuration.
Thus, let’s check if there is a DNS entry pointing to
Virtual IP Address of the CAS array and check load balancer's configuration.
http://blogs.technet.com/b/omers/archive/2010/10/11/microsoft-exchange-2010-cas-array-steps-and-recommendations.aspx
For the Lync issue, I recommend you ask for more professional help on our Lync forum:
http://social.technet.microsoft.com/Forums/lync/en-US/home?category=ocs
If you have any question, please feel free to let me know.
Thanks,
Angela
We
are trying to better understand customer views on social support experience, so your participation in this
interview project would be greatly appreciated if you have time.
Thanks for helping make community forums a great place.

Iphone 5 loses connectivity to exchange server

I know this is pretty common with Exchange servers...any news/updates? I have heard it is impossible to drop back to a previous version of IOS...like 6.1...too bad!

Thanks James, however I have tried that numerous times. Even tried to restore the phone to factory settings however I am getting an error that prevents the restore. I'm starting to believe there is something wrong with the phone.

Windows 7 Pro Client loses connectivity to internal Win2k8 web server

1. affected workstation are Optiplex 380 running Win 7 pro sp1 with broadcom NICs.
2. Internal users use a internal webserver for customer invoicing application. Users lose connectivity to this internal web server, all other networking works, network shares, internet, etc. If I try to ping the webserver IP I get no reply. XP
machines are not affected. Not a DHCP issue as there are plenty of IPs.
3. I have tried different internal NICs (3com) but still had issue. I have upgraded BIOS, nic drivers. etc.
4. I rebuilt one of the machines using Windows XP pro sp3 and have had no issue with that workstation.
the problem started a few months or so ago. I have not been able to determine the source. I tried running wireshark but nothing stuck out. I have changed the session settings on the IIS server from 15 minutes to 6 hours but did not make a difference.
5. Today when client lost connectivity to the server I tried pinging from the server back to the client and the connection was restored. This issue really has me confused as I cannot find anything in the logs that sticks out.

Hello,
Thank you for your question.
I am trying to involve someone familiar with this topic to further look at this issue. There might be some time delay. Appreciate your patience.
Thank you for your understanding and support.

Network problems are preventing connection to Exchange when changing from Ethernet to Wifi

I have a user that connects to Exchange fine while their computer is docked and connected to the LAN by Ethernet, but once they undock they receive the error "Cannot open item. Network problems are preventing connection to Exchange server." They
are connected to the internal company Wi-Fi and nothing changes about their computer's status other than changing from being on the wired network to wireless.

Hi,
What's your Outlook version and Exchange version? Outlook 2007 or Outlook 2010/2013? Please check your Wifi settings and make sure your Wifi password is correct.
In Outlook, please click File > Account Settings > Security and
make sure the Encrypt data between Microsoft
Outlook and Microsoft Exchange is checked.
Regards,
Winnie Liang
TechNet Community Support

External Clients cannot connect to Exchange Server

Hello all:
My external clients using outlook cannot connect to Exchange Server 2013. We have on-presmise version updated to Cu3 and after the Cu3 update we lost connectivity with Outlook clients. Many of the settings in IIS were changed after the Cu3 update,
I noticed after my http->https redirect was not applied anymore to the default website. Here is my Get-OutlookAnywhere results:
RunspaceId : 6379fab1-f692-484f-8118-99e48330d4c4
ServerName : EXCHSERV
SSLOffloading : True
ExternalHostname : mail.domain.com
InternalHostname : mail.domain.com
ExternalClientAuthenticationMethod : Negotiate
InternalClientAuthenticationMethod : Ntlm
IISAuthenticationMethods : {Basic}
XropUrl :
ExternalClientsRequireSsl : True
InternalClientsRequireSsl : True
MetabasePath : IIS://EXCHSERV.domain.com/W3SVC/1/ROOT/Rpc
Path : D:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy\rpc
ExtendedProtectionTokenChecking : None
ExtendedProtectionFlags : {}
ExtendedProtectionSPNList : {}
AdminDisplayVersion : Version 15.0 (Build 775.38)
Server : EXCHSERV
AdminDisplayName :
ExchangeVersion : 0.20 (15.0.0.0)
Name : Rpc (Default Web Site)
DistinguishedName : CN=Rpc (Default Web
Site),CN=HTTP,CN=Protocols,CN=EXCHSERV,CN=Servers,CN=Exchange Administrative
Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=domain,CN=Microsoft
Exchange,CN=Services,CN=Configuration,DC=domain,DC=com
Identity : EXCHSERV\Rpc (Default Web Site)
Guid : 596ed7a1-ceec-4a36-9cbc-617ac5214463
ObjectCategory : domain.com/Configuration/Schema/ms-Exch-Rpc-Http-Virtual-Directory
ObjectClass : {top, msExchVirtualDirectory, msExchRpcHttpVirtualDirectory}
WhenChanged : 12/23/2013 2:20:41 AM
WhenCreated : 11/25/2013 2:51:36 PM
WhenChangedUTC : 12/23/2013 7:20:41 AM
WhenCreatedUTC : 11/25/2013 7:51:36 PM
OrganizationId :
OriginatingServer : DOMAINCONTROLLER.domain.com
IsValid : True
ObjectState : Changed
Thanks in advance

Hi,
According to your description, users cannot connect to Exchange server 2013 both internal and external.
Please run Test E-mail AutoConfiguration in Outlook to check your autodiscover service. Also
reset your Exchange virtual directory to connect correctly. If the issue still continues after all configurations are setting properly, collect some Event logs would be helpful.
If there is any question, please post the results here for further analysis.
Thanks,
Winnie Liang
TechNet Community Support

Users cannot connect to shares or sync Exchange via company wifi

Hello, I am posting this because my users can connect to the company wifi (guest and private) with no problem. They can use the internet, but nobody can reach network shares, nor can they setup or sync Exchange email via the wifi. Currently, anybody with a smartphone must be on 3g or 4g in order to get their email onsite. Laptops with wifi capability must be connected via ethernet cable in order to get to network shares and email. I've searched and searched, but cannot find anything on this. Anyone have ideas?

Hi Luis,
I am using a Cisco ASA 5510 with two Cisco AP 2600's. After digging in their configuration settings, I was able to see that the AP's IP addresses are completely different than our internal IP's, which would explain why Exchange isn't able to sync. Unless I am misunderstanding how they work, shouldn't they be giving out the same Ip scheme as the ASA? (i.e. ASA IP scheme: 10.0.10.XXX, AP IP scheme: 174.XXX.XXX.XXX)
Your help is greatly appreciated.
Thank you,
Jye

Writing client app to connect to Exchange Server 2013 and set OOF for users on vacation

I am coding an C# app that should connect to Exchange Server 2013 on-premise (Servers Location is not in our Company). I`ve got an account (User and Pass) with readonly admin-rights for now and want to read and set OutOfOffice Objects for other users. I
decide to use EWS Managed API over Autodiscovery but I am bit confuse how
I tried to connect with "service.UseDefaultCredentials = true" and read contacts -> this code works:
try
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= new WebCredentials("service.exchange",
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= true;
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= TraceFlags.All; _service.UseDefaultCredentials
= true;
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RedirectionUrlValidationCallback);
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(Contact contact in _service.FindItems(WellKnownFolderName.Contacts,
new ItemView(2)))
var test = contact;
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(Exception exception)
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and "Impersonation" (NTLM and Basic Authentication) I'am a bit confused. Can anybody help me?

hi,
when you set a credential, you don't have to set the UseDefaultCredentials property (it is already updated).
For autodiscover, you should try to set the property EnableScpLookup to True if you are in the Exchange domain or it is known by the current domain.
Autodiscover uses a domain query (through Active Directory) and/or a dns query (this requires a DNS register for autodiscover.domain.net) to determine the access to the autodiscover service URI.
Regards,
Désiré GOVIN Refresh IT Solutions

Re: (forte-users) DBSessions randomly lose connection toOracle

Try setting the flag trc:lo:25 on the partition where the DBSession gets
disconnected. It should tell you the reason what is error that is
bringing down the DBSession.
-Ashish
"Musgrove, Mark" <[email protected]> on 10/21/99 10:52:43 AM
To: [email protected]
cc: (bcc: Ashish Joshi/Consultant/NAC)
Fax to:
Subject: (forte-users) DBSessions randomly lose connection to Oracle
We have two applications deployed to our production environment(3.0.G.2).
We have three HP's with Unix 10.20. Server 1 is our database server.
Server2 supports all of Application1 and Server3 supports all of
Application2. Our database is Oracle 7.3.3.4. We are finding that during
the course of a normal day, our users will receive the following error:
"The DBSession that you are using is no longer connected to a
database..."
Our database connections are replicated. It will occur in only some of our
replicates. I then go through the application and force a reconnect on all
of the database connections and the users can continue on with their
processing. This happens randomly during the day at different times, with
different applications, on different servers. I have talked to Forte
support and they suggested some trace flags (trc:db:6:6, trc:db:11:11 and
trc:db:13:13). None of the flags have produced any helpful information.
When you look at it from the Forte side, it thinks that it still has a
valid DB connection. When you look at it from the Oracle side, Oracle
thinks that it still has a valid connection. Somewhere our connections are
getting "stepped on". We have looked at SQLNet and nothing shows up in
the logs. Where else should I look? What else could be causing the
problem? Any suggestions are greatly appreciated.
Mark Musgrove
Forte Consultant (Object Technologies, Inc)
Signed by : Mark Musgrove/BCS/BBS/BLS
Signed on : 10/21/99 09:54:25
Certifier : /BLS

Try setting the flag trc:lo:25 on the partition where the DBSession gets
disconnected. It should tell you the reason what is error that is
bringing down the DBSession.
-Ashish
"Musgrove, Mark" <[email protected]> on 10/21/99 10:52:43 AM
To: [email protected]
cc: (bcc: Ashish Joshi/Consultant/NAC)
Fax to:
Subject: (forte-users) DBSessions randomly lose connection to Oracle
We have two applications deployed to our production environment(3.0.G.2).
We have three HP's with Unix 10.20. Server 1 is our database server.
Server2 supports all of Application1 and Server3 supports all of
Application2. Our database is Oracle 7.3.3.4. We are finding that during
the course of a normal day, our users will receive the following error:
"The DBSession that you are using is no longer connected to a
database..."
Our database connections are replicated. It will occur in only some of our
replicates. I then go through the application and force a reconnect on all
of the database connections and the users can continue on with their
processing. This happens randomly during the day at different times, with
different applications, on different servers. I have talked to Forte
support and they suggested some trace flags (trc:db:6:6, trc:db:11:11 and
trc:db:13:13). None of the flags have produced any helpful information.
When you look at it from the Forte side, it thinks that it still has a
valid DB connection. When you look at it from the Oracle side, Oracle
thinks that it still has a valid connection. Somewhere our connections are
getting "stepped on". We have looked at SQLNet and nothing shows up in
the logs. Where else should I look? What else could be causing the
problem? Any suggestions are greatly appreciated.
Mark Musgrove
Forte Consultant (Object Technologies, Inc)
Signed by : Mark Musgrove/BCS/BBS/BLS
Signed on : 10/21/99 09:54:25
Certifier : /BLS

Outlook 2013 connection status 'Exchange Directory' disconnected randomly for random users (Exchange 2013)

We have been encountering an issue where upon random Outlook 2013 users are unable to open the address book, or add a room to a meeting (using 'Add Rooms...' button), and an error message is displayed that the server is unavailable. Mail flow and
everything else functions normally.
If I look at the Outlook connection status of an affected user, I will see that all connections are established except for the 'Exchange Directory' connections which show disconnected. If I click the 'Reconnect' button the Exchange Directory connections
are re-established, and the user can now access the address book/meeting rooms as normal.
Are there any ideas what I would check, logs I could look at, events or anything I can check on the server side that might lead me to an answer what could cause this?

Outlook 2013 gets that data from Exchange 2013 by connecting to Exchange Web Services. That's where you should look.
Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

EAC loses connect to Mailbox Database Server

I am having a weird issue with EAC. We have 2 mailbox databases but only 1 is used as the main production, on a separate server. The other database was the first one in the implementation. It hosts system attendant and a couple of administrative
accounts. This mailbox database was dismouting so I ran eseutil and it showed a dirty shutdown state. I ran the log file sequence which checked out fine. I completed a soft repair using /r option. After this the database was in a clean
shutdown state. I rebooted the server and the database mounted successfully.
The odd issues is that EAC will lose connection to this mailbox database and show in an Unknown Status showing 1 failed copy. However, if I check that server the mailbox database shows mounted and healthy. After a while it will remount.
When double clicking on the database name it says the information store isn't running but it is running on that server.
Even though this isn't the main production server for the users we have noticed that outlook will disconnect for users. Only after restarting services on the CAS (Separate server) will services return to healthy. I have scowered the event logs
and find hardly any information that relates to the issue.
The only error I see but have found almost no information on is MSExchange Mid-Tier Storage Ping of mdb 'e7304e5c-37f5-4fb4-8e6a-02f4426f0820' timed out after '00:00:00' minutes. Last successful ping was at '2/28/2014 2:39:55 PM' UTC.
I almost think its an issue with the CAS server hosting EAC. Maybe an IIS issue? However I can't find any errors on this server related to it. Any help would be appreciated.

Hi,
I would like to clarify the following things for troubleshooting:
1. Please run IISReset from command prompt at first.
2. What's more, I recommend you run the Get-MailboxDatabase "xxx" cmdlet and check the result.
Besides, please confirm that if there is any user reporting any Outlook/Exchange usage problem.
Hope my clarification is helpful.
If you need further assistance, please feel free to let me know.
Best regards,
Amy
Amy Wang
TechNet Community Support

Users lose connection to Exchange.

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