Is anyone else having issues using Lync (Skype for Business) when messaging, or sending file transfers, to someone in a separate Skype Organisation in an external network?
Not sure if this is a bug or not, as the application is being seen as Incomplete, and looking at Packet Captures the SYN ACK isn't being received.
It's on-premise so yes their own SFB infrastructure. Disabling decryption meant we could send files through 5 attempts but after that it failed. Looking into the PCAPs and flow basic shows that two internal IP addresses are trying to talk to one another. This is something to do with STUN right? Instead of STUN it's trying to use ports 50,000-59,000.
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