XG 18.0.4 M4-4 Mac Mail IMAP unable to connect (DPI issue)

Hi There,

I'm not sure when it started but on a Mac if I'm using the Mail app or the Outlook app and try to add a Yahoo IMAP account the XG Firewall is not allowing it to connect using SSL 993 and I can't see why, it is the DPI engine that is responsible for this as if I go to "Rules and Policies" > "SSL/TLS inspection rules" > "SSL/TLS inspection settings" > "Advanced settings"  and turn off "SSL/TLS engine" everything starts working fine, I cannot see any logs in the Log Viewer to suggest dropped packet data for any reason. I'm not using any mail scanning settings or anything complicated/specific, can anyone advise ?

  • Is there any way I can view the DPI engine log verbosely to see if that shows anything ?
  • I've tried a tcpdump for port 993 on the firewall but that wasn't too helpful
  • The Mac apps don't place nicely with HTTPS/SSL proxy apps so that doesn't help much.


Edited TAGs
[edited by: emmosophos at 9:49 PM (GMT -7) on 2 Apr 2021]