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From few day "Invalid traffic - Could not associate packet to any connection"

Hello,
I've been detecting a strange behavior on an xgs 2300 (SFOS 19.0.1 MR-1-Build365) for a few days.
At first the connections of some PCs to an IP seem to work but then I start to log a series of errors such as "Invalid traffic" (I attach a screenshot). The firewall rule is a simple LAN to Wan rule without any checks (only audio streaming checks). Other PCs, on the other hand, access easily. The destination IP is from a banking institution and with this firewall configuration it has never had reachability problems. Can I investigate what?



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  • Hi Lucas and thanks for the reply.
    In fact I had already read the page you pointed me to but as I read in a note on the same page "This does not resolve issues. This will only decrease the number of invalid traffic events logged by Sophos Firewall." And unfortunately this is my problem: a stable situation until last Friday which suddenly prevents me from accessing some sites with a high increase in logs due to "Invalid Traffic". I'm waiting for my customer to try a reset of a PC on Friday to see if any windows update caused this problem. Is there a method to close all idle sessions?

  • This is likely not a problem caused by the firewall. Invalid traffic is some symptom and idle session or closed session are caused by the client. 

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  • Thank you again; so now I'm checking some changes on client and I'll come back with good news.. I hope

  • Hi LuCar, my client reverted the PC to a recovery point and now everithing seems to work good. The cause probably was latest windows update. Thank you again for supportt.