
osj42.blogspot.com
One SysAdmin's JourneyA blog about things I run into doing my job as a Systems Administrator that I think others might find interesting or useful. Exchange: 421 internal B channel certificate unknown. We have been seeing this error on a few of our customers with WatchGuard XTM firewalls. The resolution is to disable deep inspection of SMTP. Go to Firewall Firewall Policies (select the policy that controls outbound email) Proxy Actions TLS Encryption. Repeat for the inbound policy. Friday, June 06, 2014. Links to this post.
http://osj42.blogspot.com/