Server refused to allocate pty

Today, on a Fedora 3 machine without control panel, I encountered this error with ssh:

login as: root
root@xx.xx.xx.xx's password:
Server refused to allocate pty

It's very strange as there is nothing, no any website running or other application.

Now, I'm waiting response from datacenter. I think reboot will solve the problem.
But what is the cause, what can I do to prevent this to happened in the future?

Thanks!

 

 

 

 

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