problem with installing horde on suse10.1 with squirrelmail

After I have installed all the packages needed by horde,and have tested horde in browser by input [url]http://192.168.33.56/horde/test.php[/url],and it views OK!Then I configure horde in browser by input [url]http://192.168.33.56/horde.[/url] When I use my email address to login horde,it show the error that:登录失败, 请检查您的用户名和密码, 然后重试.(I'm sure that I have input the correct information!)

I have checked the log in /var/log/apache2/error_log,it show the errors like follows:
[Tue Aug 14 19:45:42 2007] [error] [client 192.168.33.54] PHP Notice:  Unknown: Connection failed to srcloft3.3322.org,143: \xe8\xbf\x9e\xe6\x8e\xa5\xe8\xb6\x85\xe6\x97\xb6 (errflg=2) in Unknown on line 0, referer: [url]http://192.168.33.56/horde/login.php[/url]

I am sure that the port 143 is opening on the service.but I telnet srcloft3.3322.org 143,it can't link!

I find  lots of informations by google and baidu,but it won't help!

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