Well, my client uses GroupWise 7 running on NetWare 6.5 SP8 as a virtual machine on VSphere 5.5. They'll have to pry Netware and GroupWise 7 out of his cold, dead, fingers!
I have managed to replicate the issue in the lab several times. They used to backup the MAIL: volume every night and run a purgevolume every weekend. No problems at all with backing up, but as soon as they restored either the complete VM OR the MAIL: volume, it immediately dropped the link and gave the error.
On top of that, they discovered that a couple of users are using Web Access on their iPads and after a restore, they could no longer log in and they got garbage on the screen. It was for this reason that they stopped backing up the mail server and relied instead on dbCopy.
I wasn't actually called in for this problem, it was for stuck obituaries, but this one also came up, even after everything was cleaned up and working.
I'm pleased to say that I solved both problems and if anyone else gets this issue, here is the solution.SOLUTION
When you restore the backup the GroupWise System or the mail Volume, GroupWise 7 loses the connection between the POA and the MTA. You get the message "Post Office now Closed" on the MTA.
The log file shows the following error:
Unable to open connection 0x8925. Address = <server_IP>. Port = 7101.
The fix for this is as follows : -
At the server console, bring up the POA console.
Press F10 to view the options.
Edit Startup File (at the bottom)
Scroll down (pgdn) to the very end of the configuration file (SYS:System\<PostOffice>.POA) and add the following lines:
/MTPINIPADDR-<server IP address>
/MTPOUTIPADDR-<server IP address>
Restart both the POA and the MTA. You may get messages on the MTA about a requested restart and this restart being ignored - in this case manually restart the MTA by pressing F6.
Note: if this happens after a migration do not forget to rebuild the Post Office.
You may also need to re-install WebAccess. Just run the install and accept all the previous settings.
It isn't as though it's a common occurrence to have to restore from Backup, and putting the few extra lines into the POA doesn't affect normal operations. So IF a restore is necessary the problem doesn't happen.
It's a bit of a pain to have to re-install the WebAccess, but I couldn't find any other way to fix this, but my client is now happy to backup the MAIL:volume every night again!.