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

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