How to debug a check_http problem?

[Götz Reinicke]

Hi,

recently I noticed, that checking some virtual http services fails.

If I launch the check_http command by hand, I do get a "HTTP OK" message.

If the check is launched by nagios, it fails with an "HTTP WARNING:
HTTP/1.1 404 Not Found" message.

Checking some non-virtual http-servers works fine.

What could be the problem?

Thanks for any hint and best regards

Götz Reinicke
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