Wrong referring site: mail won't get deleted

[Maffy]

I have YaBB SE ver.1.5.3. Boards and intern messages  can't get deleted on the imagebutton but only the checkbox + delete all messages. This works about 3 to 4 times at a fresh install, then it won't.
ERROR: Wrong referring site.
Linkcode of the button: (DK language)
javascript:DoConfirm('Fjern denne besked?','http://localhost/forum/yabb/index.php?board=2;action=modify2;threadid=4;msg=11;d=1;start=0;sesc=7e83f492ed2ab77001b6e7e41b634641');
PHP is 4.3.1, Server iis5.1 on XP Pro running local .
Any suggestions?  

[Maffy]

OK, i have written about a problem on XP PRO iis5,1 where boards and mails cannot be deletet from the forum. No-one has replyed yet, but someone must have written the damn code in yabb se 153 !  So what does subject mean ? Where are you hiding?

[[Unknown]]

Your board URL and actual URL differ.

Please do not use redirection services like cjb, come.to, etc.

-[Unknown]

[Maffy]

Your board URL and actual URL differ.

Please do not use redirection services like cjb, come.to, etc.

-[Unknown]

So something like this has inflection on my board(s).
The forum has only and are running local . I have no connection to the net until august.

Thanks for the hint ! I have had the server running with NO ip-address, so changing to 127.0.0.1 helped a lot.
Everything works again.

THANKS!