Login to server imap.zoho.com failed.

Login to server imap.zoho.com failed.

I am using Thunderbird 24.1.0 on LINUX Mint 15.

When ever I try to download email through Thunderbird it show "Login to server imap.zoho.com failed."

I have following setting :
Server Name : imap.zoho.com
Port : 993
Authentication Method: Normal Password
Connection Security : SSL/TLS

Server Name : smpt.zoho.com
Port : 465
Authentication Method: Normal Password
Connection Security : SSL/TLS

I ma providing correct username and password. I have check it through website and work fine.

My problem started few day ago after activation of verification through ZOHO MAIL.

my other zoho emails are working fine.

I con't figure out the problem.