Hi,

A particular PC is giving an error " cannot connect to the server temporarily", the user is able to login on another PC and no one is able to login to lync 2010 ( internal user ) on this particular PC.

Options tried:

1) Deleted sip folder under app data.

2) Uninstall and reinstall Lync client.

3) checked timezone and srv records.

4) checked ping to FE and director server.

) checked manually adding FE on lync client.

Your inputs/suggestions would of great help.

Thanks.

Verify from following:

1- Firewall is disabled.

2- Srv record is resolving correct.

3-If you use proxy, you add sip address in exception.

Also you can refer below link

http://support.microsoft.com/kb/2619522

Is the computer join the domain?

Run the following command to check the automatic configuration is working

Nslookup

>set type=srv

>_sipinternaltls._tcp.<sip domain>.com(for internal user)

>_sip._tls<sip domain>.com(for external user)

If you can ping to FE, please try to sign in with manual configuration.