Introduction Over the past few years browsers such as Chrome or Firefox have started deprecating known vulnerabilities in SSL/TLS encryption - vulnerabilities that can break the encryption. Where this post’s issue lies is that IETF have prohibited the use of RC4. The Issue Now, what happens if you need to access something via HTTPS, say an AudioCodes that uses the RC4 cipher? You will probably be presented with an error such as in Chrome: “ERR_SSL_VERSION_OR_CIPHER_MISMATCH”.

This is a real strange one. I recently had a customer who could not transfer or conference PSTN calls using a CCE (they were able to before). This was from a mixture of Skype for Business clients, Polycom VVX handsets and Polycom CX3000 conference phones. When attempting a transfer on the Skype for Business client I got “Cannot complete the transfer”, when attempting an escalation to a conference I got “An error occurred”.

Introduction Although Microsoft’s Cloud Connector Edition (CCE) is pitched as a ‘black box’ where you just need to follow the instructions to set it up and all is well, this is not always the case. If you do have issues (as I have had on a few occasions), you will probably want to capture some logs to investigate. Whilst not exactly the same, it’s not too dissimilar to the CLS Logging on Skype for Business Server.