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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
    Its not just udp but also tcp...

    We had a dnat rule which forwards port 80 to a web server and we noticed a remote host hogging the connection and put a firewall rule to block the external ip and it continued.

    I even removed the dnat rule and still the connection stayed active. It was only by myself stoping the webserver did it block.
  • 0 in reply to stealthmatt_01
    Do we know if this has been logged as a bug?  Is it being addressed?  I don't know where to find this kind of information.

    Sorry.
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