Cisco Unified SSL Issue with New Firefox

Issue

Since the 30th of June of 2015, Mozilla Firefox doesn’t support connections to a server with weak Diffie-Hellman ciphers anymore (Mozilla Release Notes🙂

Solution

Perform at your own risk. Accidental adjustment may effect Firefox’s performance. To fix type about:config in your Firefox web browser, in the address bar. Change the next settings with the next values:

security.ssl3.dhe_rsa_aes_128_sha=false
security.ssl3.dhe_rsa_aes_256_sha=false

The values should be true by default. Click on them to change to “false.”

Now your Cisco Unified Communications Manager is accessible.

Comments are closed