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Unable to Use Telnet Because Firewall is Blocking "System"

RalphMalph

I am trying to use a telnet connection between a custom app and a terminal emulator and Sophos Firewall blocks the connection saying invalid checksum for "system".  I have no idea how to add a checksum for "system".  What is this trying to tell me?

:48470


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    Hello RalphMalph,

    I don't know what you mean by Interactive mode ... I don't get a popup asking to change the checksum

    Interactive mode, where the user is prompted when there is an unknown application or traffic without a matching rule, is not available on Windows 8. As this popup will only be displayed in interactive mode you can't get it.

    the events subtree

    is near the bottom in the Firewall Log viewer's left pane (at least in SCF 2.9, dunno about 3.0)

    The second record suggests that SCF thinks telnet's checksum is incorrect. Why it displays system as application most of the time I can't say. I'd suggest that you contact Support. 

    Christian

    :48540
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  • 0

    Hello RalphMalph,

    I don't know what you mean by Interactive mode ... I don't get a popup asking to change the checksum

    Interactive mode, where the user is prompted when there is an unknown application or traffic without a matching rule, is not available on Windows 8. As this popup will only be displayed in interactive mode you can't get it.

    the events subtree

    is near the bottom in the Firewall Log viewer's left pane (at least in SCF 2.9, dunno about 3.0)

    The second record suggests that SCF thinks telnet's checksum is incorrect. Why it displays system as application most of the time I can't say. I'd suggest that you contact Support. 

    Christian

    :48540
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