After renew the Lync server internal certificate All Lync IP phones in the network could not be able to sign in to the server.it says " Please verify your sign in address domain\user name and password.........."
However when i tried to login from the external network using the phone with USB cable that was successfully sign in to the system.
when i browse the following URL there is certificate error appear in the web browser please refer the attached screen capture
Pleas help me to fix this login issue