Today we installed Plesk 8.1 on Windows server R2. everything was ok EXCEPT Horde webmail! When I requested for horde webmail I received:
CGI Error-The specified CGI application misbehaved by not returning a complete set of HTTP headers
I didn't find any reason for it! Everything was ok. All permissions and configuration. At the end I just look at php.ini and replace it with another horde's php.ini and it solved our big problem! I should mention that when I reconfigured webmail with these two commands:
"%plesk_bin%\defpackagemng.exe" --fix --type=webmail
I received the error again anad again!