I have the following setup on our network.
INTERNET --> FIREWALL 1 --> Zimbra Front End --> FIREWALL 2 --> Zimbra Mail Store
I am getting mail flow down to the mail store, my only problem is the web interface. I get a 502 bad gateway error from nginx. If I connect directly to the mail store server, I can login.
I have changed our DNS records, so that the front end should be looking at firewall 2 to locate the mail server (port forwards are setup on firewall 2 to the mail store server).
I am thinking that I may be missing a port forward somewhere - but I could be wrong :\.
Any ideas\suggestions welcome.