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Firewall fails to block an established UDP connection...

GreatByte
Hello Guys,

I am have a weird situation here. I have a PC communicating with a server, both connected to my Sophos Firewall (Firmware: 9.100-16 - not an appliance).

I have a Rule that allows this connection, and it works. Without that Rule, the connection cannot be established. So far so good.
Once established, however, the communication continues even if I disable that rule, or add a rule above it to block that connection. [:S]
It just keeps on working and there doesnt seem to be a way to block it if I wanted to...

I tried it using a PC connected via the Internet and I can even disable the DNat Rule and the connection still continues. Only new connections are being blocked. Is this an expected behavior? Doesnt seem right to me.

Greatbyte


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  • 0
    This "bug" does not only affect new rules but renders rules with time periods defined ineffective.  If users have established connections that are supposed to be terminated at a specific time, their session is never terminated as long as data is flowing.  Seems pretty serious to me.
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  • 0
    This "bug" does not only affect new rules but renders rules with time periods defined ineffective.  If users have established connections that are supposed to be terminated at a specific time, their session is never terminated as long as data is flowing.  Seems pretty serious to me.
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