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Delayed Printing / Invalid Traffic

I'm not sure we might face a similar problem to https://community.sophos.com/sophos-xg-firewall/f/discussions/131346/sophos-xg-firewalls-printer-delay-or-not-printing-at-all

We implemented a new Sophos XGS 3100 running SFOS V19. Basic firewall-rules in place, no IPS, SSL decryption, active by now.
There's one printer we're seeing some jobs taking around 5 minutes to finish.

Firwall log on XG showing multiple "Invalid traffic" records between printer and printserver, tcp 9100.

But no hits in IPS, DOS, ...

 was this fixed in your environment by updating to 18.5 MR2? tried V19 yet?

Any ideas?



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