My Outlook Express showing Error message

My outlook express is recently showing an error message, which make me unable to sent mails through that.
Error message says that "error number 0x800ccc17" and it has a error message which says "fpostoffic.isp.net,protocol pop3 port 995,secure (ssl:". It is totally making my plans upside down,
I want some one's help to solve this problem.
Please help me.
