webmail errors since this morning

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http://forums.cpanel.net – Hi, since early this morning, none of the accounts in one of my servers are able to use webmail. Apparently, there is no problem using desktop e-mail clients, this only affects webmail. Users can login to cPanel's webmail but can't use webmail clients. The error messages are: In HORDE: Login failed because your username or password was entered incorrectly In SquirrelMail: Warning: fsockopen() [function.fsockopen]: unable to connect to localhost:143 (php_network_getaddresses: getaddrinfo failed: Name or service not known) in /usr/local/cpanel/base/3rdparty/squirrelmail/plugins/login_aut (HowTos)