XGS Stopped Working (18.5.3)

Question

(2) Sophos XGS4500 (SFOS 18.5.3 MR-3-Build408) HA

I was wondering if anyone has seen this issue.
Yesterday our XGS just stopped passing traffic (nothing would go through). The XGS was accessible internal (web interface and ssh) and was able to communicate to external. Just nothing would pass through and no errors anywhere I could find.

Forcing a failover to the auxiliary XGS solved the issue and everything came back up. Switching back to the primary also everything is now fine.

The XGS has been solid for months with no issues.
The only change that has been made to the XGS was the update to 18.5.3 last week.

I am now a little uneasy about the stability of 18.5.3 and thinking of rolling back to 18.5.2.
Wanted to see if anyone else has seen this issue or if it was just a fluke.

Thank You,
-Peter Mastrangelo

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Andreas Hahn1 · Accepted Answer

We were able to solve our problem, it was the IPv6 DHCP server. The problem has occurred in all versions from 18.5.2

JasP · Answer

We have an open case with Sophos regarding this (Case# 05098782-050987). This has now been escalated all the way through global escalation specialists (GES) to Development (basically as high as it gets) - Development reference number: NC-92066 
 We've had the issue with 18.5.2, 18.5.3 and 19.0 
 Pair of XGS 116 in HA. Primary stops passing traffic and HA fails over to Auxillary. If you reboot the failed XGS, the HA is restored. If you don't reboot the failed XGS, the new Primary will eventually fail, leaving you with no internet connectivity. 
 I would suggest those affected open a case with Sophos and reference our case number and the development reference number. If you already have a case I would suggest you pass our case details on to your current support specialist.

XGS Stopped Working (18.5.3)

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