Can't configure my yahoo account

[hanysys]

I have this error when I try to configure ZDesktop with my Yahoo:
Service error. Please check your server settings; verify your email address, password or client access permissions (if required).

I really don't know what is wrong, this is the zdesktop.out file content:
0 INFO [main] log - Logging to org.slf4j.impl.Log4jLoggerAdapter(org.mortbay.log) via org.mortbay.log.Slf4jLog
563 INFO [main] log - jetty-6.1.5
703 INFO [main] log - No Transaction manager found - if your webapp requires one, please configure one.
Zimbra server process is running as uid=-1 euid=-1 gid=-1 egid=-1

The only thing that I can think in it right now is that my connection is going through a proxy (Microsoft ISA), is there any specific configurations in this ???!

Thanks in advance

[jjzhuang]

We don't yet support proxies.

[pbreit]

I'm getting that same error when trying to set up an IMAP account that works fine on other email clients (Mail.app, Thunderbird). I do not have any proxies as far as I know. Mailbox is a GridServer account at MediaTemple.

"Service error. Please check your server settings; verify your email address, password or client access permissions (if required)."

From zdesktop.log:

2008-12-02 15:37:54,801 INFO [btpool0-5] [name=zimbra;ip=127.0.0.1;] datasource - Testing DataSource: { id=96fdac40-1a8a-4741-9521-0ce051db194f, type=imap, isEnabled=true, name=Cheeko B, host=mail.cheekob.com, port=143, connectionType=cleartext, username=patrick@cheekob.com, folderId=1 }
2008-12-02 15:37:55,034 INFO [btpool0-5] [name=zimbra;ip=127.0.0.1;] datasource - Error connecting to mail store:
java.net.SocketException: Connection reset