I have a multiserver setup with mtas in the public namespace and MSS in a private network. Since upgrade to 6.0.8 AUTH through SMTP (both STARTLS and TLS) started failing. It turned out, MTAs need access to backend via port 7071, which is admin console and it was blocked..I made a tcpdump and it seems it has got something to do with the certificates (we have a commercial one), but the rest is encrypted/encoded to me..
I'm rather unhappy about this as I don't see any sensible reason to have AdminConsole exposed to the internet for such silly reasons.. So is this a bug or a result of some misconfiguration?