[jcifs] Connection timeout (because of bad network) once, then can't connect to the server anymore

[Wendy]

I am using jcifs-krb5-1.2.13.
I cannot conect to the server(windows server 2003) when the network is poor or 
the server don't share the folder.
Then network works well  and the server do share the folder.
But I got  jcifs.smb.SmbAuthException: Access is denied.
I can connect to another server which works well all the time.
That's something like following link
http://article.gmane.org/gmane.network.samba.java/4949/match=transportexception
Is this still a bug?OR I should do someting in my App?
I try jcifs-1.2.17,but it is still a problem.
Thank you.
Wendy