Persistent Canon Printer Disconnection Issue with UniFlow and Fortinet Firewall

[faisalvt]

I hope this post finds you well. I'm reaching out to the community for some expert advice on a persistent issue we've been facing for the past year. Despite multiple tickets with Fortinet support, we haven't been able to identify the root cause or find a lasting solution.

The Problem: Our Canon printers are experiencing frequent disconnections from Uniflow (Print Server). This issue seems to be particularly prevalent after power failures in our remote offices. Interestingly, the printers reconnect after a couple of days or when we change the printer's IP address.

Here's a bit about our network setup:

• Branch Fortinet firewall is connected to the HQ Fortinet firewall via an IPsec VPN.
• The print server is located in the HQ.
• The Printers are in our remote offices
• Branch firewall we are using Fortigate101F,81E,61F(Firmware 7.2.4)
• HQ firewall  Fortigate601E(Firmware 7.2.4)
• Branch and HQ firewall are connected over IPsec VPN

[AEK]

Have you found in traffic logs any blocked traffic from printer to print server or vice versa? Make sure the related policies have all traffic log enabled, and implicit deny policy as well.

On the other hand ha e you checked if one of the two devices was listed in quarantine monitor during the issue?