Can't resolve hostname

[s.tancioni]

I have a very big problem:
today I have upgraded my ubuntu 5.10 to 6.06, following the instructions on many sites.
After the upgrading Horde and Plesk CP no work anymore.
So I installed again horde and began to work.
But Plesk CP cannot work.
It appears the screen of the first installation, I fill the hostname field with the hostname value.
This value is the one that the shell returns on typing 'hostname'

these are value of the /etc/hosts

127.0.0.1 localhost.localdomain localhost server
192.168.0.16 server.wbitalia.it server server

If I type ping server.wbitalia.it It tries to ping 192.168.0.16 (correct)
But if I type server.wbitalia.it in the hostname field Plesk CP says

Warning: Fill the requested information into the appropriate fields. This information is required for Plesk to work.

The other information are about the network interfaces, and the IP of the server (192.168.0.16)
On the plesk KB I found tips about changing the /etc/hosts.
This is what I have done but Plesk CP still not works.

I'm very sorry for my bad english.

Please help me if you can !!!
Thanks a lot
Simon

 

[DmitryT]

s.tancioni

Try to disable hostname checking through shell:

# export PLESK_DISABLE_HOSTNAME_CHECKING=yes

and check once again if it works.