I see intermittent "Status: 64 The specified network name is no longer available" in my TMG logs for a a couple of published web servers that are part of an application. I fear its impact on users increases as the number of users and connections increases. I am trying to determine if this is part of the cause of web application issues or a symptom of web application issues.
I also sometimes see 10054 and 10053 errors for the same published web severs. I haev HTTPS inspection disabled. Both use HTTPS, one on 443 and the other on 8443.