Hi, > Are you sure that the kolab server knows that it is > kolab.taj-mahal.lan? > i.e. do you have an entry for kolab.taj-mahal.lan in /etc/hosts ? > > -- Diego Thanks a lot. That was the problem. In the /etc/hosts was a wrong ip-address for the kolab server. After i put the right ip-address in, horde worked without any problem. Regards, Jochen