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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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    This is Windows 8.  Ever since I installed Sophos on this machine it has acted oddly.  When a browser is updated I don't get a popup asking to change the checksum, the browser just stops working and I have to recognize that the checksum needs to be manually updated. 

    I don't know what you mean by Interactive mode and I don't know about the events subtree.

    Here is the record.

    12:03:05 PM    system    OUT REFUSED     TCP    127.0.0.1    Telnet    Invalid Checksum

    Once when I ran the same test I got this result

    12:12:57 PM    telnet.exe    OUT REFUSED     TCP    127.0.0.1    Telnet    Invalid Checksum

    I was focusing on the socket server program and I realized this message is coming from the client end, the telnet program under windows.  This is run from a command window using the command line "telnet localhost  -t vtnt".  I tried adding the program cmd.exe with no better results.  I gave it the remote access client rule. 

    :48522
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  • 0

    This is Windows 8.  Ever since I installed Sophos on this machine it has acted oddly.  When a browser is updated I don't get a popup asking to change the checksum, the browser just stops working and I have to recognize that the checksum needs to be manually updated. 

    I don't know what you mean by Interactive mode and I don't know about the events subtree.

    Here is the record.

    12:03:05 PM    system    OUT REFUSED     TCP    127.0.0.1    Telnet    Invalid Checksum

    Once when I ran the same test I got this result

    12:12:57 PM    telnet.exe    OUT REFUSED     TCP    127.0.0.1    Telnet    Invalid Checksum

    I was focusing on the socket server program and I realized this message is coming from the client end, the telnet program under windows.  This is run from a command window using the command line "telnet localhost  -t vtnt".  I tried adding the program cmd.exe with no better results.  I gave it the remote access client rule. 

    :48522
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