Nagios Support Forum

I'm trying to test a telnet connection with check_tcp. When the end-service is not working, it still accepts connections, but closes them immediately. So check_tcp always passes.

Is there anyway to make check_tcp require a few seconds of open connection? I tried using delay parameter - no good. I tried sending commands and using expected text, but I'm not familiar with what commands to send and via a manual test connection, it doesn't really respond to anything.

Thanks.

What does the TCP connection do? Generally you can use --send and expect some sort of reply. If your device is closing the connection you won't get that reply and that would be where you'd error out.

OR I can't replicate your setup so you'll have to test it, I don't think there is any other way to do it without you modifying the code and recompiling or writing your own script.