[Xymon] inverted http test

Hi, I am sure this was asked in past, but I couldn't find the post anymore....

I am looking for a way to check if a domain is available and if, I would like to get an alert. I know, I usually can do it with an ! in the beginning of a test, but this doesn't seems to work for http tests.

Here my test:

192.168.144.254 MyDomain # NET:intern
NAME:"MyDomain" !telnet !http://MyDomain.com !conn

It doesn't work for me. 'telnet' and 'conn' works fine with a !, but not the http test.

Any ideas?

Thanks in advance

Maik