Hi, Facing a issue with Lync 2010 server, would appreciate if you can provide some inputs. Below is the description -

We are in process to migrate all servers from an old datacenter to new datacenter. We have a Lync 2010 pool in old DC and now er have built another pool in same organization in new DC. Both pools have SSL certificate from different external vendors. Old pool all servers have certificate from Comodo while new pool have it from Geotrust. we oved few users to new pool and everything is working fine for internally for all users. We are using old DC reverse proxy for all simple urls in Lync organizations and we have put a new reverse proxy in new pool which only has new pool external web services url live on it. so you can say we are using 2 reverse proxy in 2 pools. We are facing 2 issues in for new pool users except that everything is working fine. below is the issue details -

1. Few users were moved from old pool to new pool and except 2-3 users it is working fine for all. those users are unable to join old calls (which were scheduled when user was in old pool) and they are getting error in browser saying "500 - Internal Server Error    There is a problem with the resource you are looking for and it can not be displayed". I removed user's Lync profile and relogged in but still issue is same. User moved back and moved in again but no luck. He was asked to sign in on Lync from some other machine and now he is able to join the meeting but can't from his own machine. This problem is arising with many users but I tried to read UCCP logs but getting just 1 error which says SIP/2.0 503 service unavailable; reason = Report error service is not available. Could you please shed some light if anything can be done to ensure that this issue doesn't comes to any user after migration to new pool.

2. When users is moved to new pool and joining a meeting from internet (remotely logged in) then he  is getting error saying "Content was blocked because it was not signed by a valid certificate". HOwever this problem is also with only few users. I moved my account and mitigated same situation but I am able to join and not getting this error. I read UCCP logs and here also I am getting error saying "SIP/2.0 503 service unavailable; reason = Report error service is not available".

Your help is highly appreciated as this is getting over my head and soon I have to initiate the migration. With migration I will change the pointing of all URLs from old reverse proxy to new reverse proxy and please note that internally everything is working fine. Thanks in advance.

Hi, Please ignore error 2 as this was resolved by placing intermediate certificate in user's machine. Kindly help in error 1. just to update, user is not getting any errors caught in UCCP logs for the same time when we get 500 internal server error.

Hi,

From your description above, the issue 1 only happen for the single machine, please also delete Lync information on Registry and Outlook user profile:

Lync information on Registry path:

HKCU\Software\Microsoft\Office\15.0\Lync\sip@domain.com

Please also make sure Lync client update to the latest version and then test again.

Best Regards,
Eason Huang