[imp] Need to login again because my IP has changed

[josep Cols]

Hello:

When I login to horde mail, after few seconds (1 to 3), the session 
logouts with a message that says (it is displayed in Catalan, and I 
transllate aproximatelly)
"Your Internet address was changed from gthe begining of the session. 
For security reasons, you must to login again".
Every time a login, the system logouts and I'n unabel to access the mail.

Any idea on what can happend?

Thanks in advance