Intermittent sshd issue

[Alex Greg]

Hi,

One of our machines has a problem every couple of weeks where it stops
accepting new SSH connections. Existing ones work fine, but any
attempt to create a new one fails with this error:

ssh_exchange_identification: Connection closed by remote host

Restarting the sshd fixes the problem for another couple of weeks, but
it keeps re-occurring. Any pointers as to how this could be fixed (for
good!) would be very much appreciated. The machine is running Fedora
Core 1.

Regards,

-- Alex