I see following output when Hudson tries to checkout code from CVS.

Started by user anonymous
[Codefromhudson] $ cvs.exe -t -d :ext:<User at CVS>@<CVS Host>:<Folder> co -P -r <Modules>
-> main: Session ID is emQrekPEc5rV5wfu
-> main loop with CVSROOT=/home/cvs/cb
-> parse_tagdate ((null), (null), <TAG Name>)
-> safe_location( where=(null) )
-> open_connection_to_server (:ext:<User at CVS>@<CVS Host>:<Folder>)
-> Starting server: ssh.exe -l <User at CVS> <CVS Host> cvs server

After Stopping the Build:
SCM check out aborted
Finished: FAILURE

in the line -> Starting server: ssh.exe -l <User at CVS> <CVS Host> cvs server
Is hudson trying to start the CVS server?? If yes then why does it try to do that?
If no, then what exactly is happening here? This is the step where my CVS checkout hangs and nothing happens further.

Please help.