Hello, 

we have 3 cas and 3 mbx exc13 cu7 environment

when a user from a specified database tries to log on OWA IM through OWA he can't 

if we move mount the database to another mbx server it works fine

all users (where their databases are mounted at mbx2) are getting this error

I used this article

http://blogs.technet.com/b/jenstr/archive/2012/10/31/troubleshooting-tips-for-exchange-2013-owa-im-integration-to-lync-2013.aspx

 and we got nothing new 

always the same error on IM logging at mbx \ v15\logging\owa\ logs 

2015-04-13T14:48:18.774Z,102,5,,,,0,DEBUG:Globals.Initialize: Initialization failed.,

Hi,

Please confirm if there is an event 103 on the Exchange Even Viewer when the user logs in OWA IM. If there is the event, please provide the detailed event log here for further analysis.

Please run the following command to check the certificate information in your Exchange server:

Get-ExchangeCertificate | fl

We need to collect the certificate thumbprint which is added in OWA web.config file and compare it with Exchange certificate results.

Generally, the certificate which is added in OWA web.config file on the MBX server(s) should be trusted by both Lync Server and Exchange. It is generally created by using your internal certificate authority on the mailbox server, making sure that the server FQDN is used for the subject name and that this FQDN appears in the certificate alternate name field.

If it is not match, please create a new certificate from your internal certificate authority on the mailbox server. Then add the certificate thumbprint in the right section of the OWA web.config file (<appSettings>), restart IIS service and check whether the issue persists.

Regards,

Hi,

Any updates?

Regards,