In the last two days, there has been a lot of users complaining that Pidgin can't connect to Yahoo protocol. It happened only in Pidgin while Kopete and many other clients worked.
To solve this problem, try to edit your Yahoo account, and change the Pager Server into cs101.msg.mud.yahoo.com. I tried this at home and it worked
Thanks to Setiajie who have gave this instructions on the list.
More information can be read here:
- Pidgin and Yahoo
- Yahoo! Messenger Blog