Concurrent Mail Session Scanning

Sulcus Posts: 5  Freshman Member
First Comment
edited April 2021 in Security
We're using the Anti-Spam feature in a Zywall 1100, but currently all mail traffic is being forwarded because the 'Concurrent Mail Session Limit' has reached the threshold of 1000'.

I can see the 'Concurrent Mail Session Scanning' bar is on 100%, but nothing is happening when I try to flush it.

Does anyone know how to flush the mail sessions without a reboot? And does anyone also has a clue where it's coming from? We only have a small office, and I'm pretty sure we don't have that many 'mail' traffic.


  • Zyxel_Charlie
    Zyxel_Charlie Posts: 1,034  Zyxel Employee
    First Anniversary Friend Collector First Answer First Comment
    Hello Sulcus,
    I suggest to upgrade your device’s FW to the latest one firstly, this issue should had been fixed on this FW version.
    The download link will be PM to you. 

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