Horde Login problem

[Christian Tardif]

Hi,

My new Kolab installation (2.3.4) is working perfectly...  well, sort of.

All created users are accessing Kolab server perfectly. All, but one. 
One of them just can't login with Horde. He can access his mails from 
his iPhone, he can access them from his Thunderbird installation (which 
synchronizes Calendar and AddressBook with SynkKolab), but he can't 
login from horde. What he gets is:

"There has been no contact with the remote server for several minutes. 
The server may be temporarily unavailable or network problems may be 
interrupting your session. You will not see any updates until the 
connection is restored."

in a red box.

What can be the problem that causes this behaviour?

Thanks,

-- 
Christian Tardif