You can easily fix this by doing a
rpm --freshen --allfiles glibc.xxx
Find the glibc rpm on your CDs or on one of the Fedora mirrors (make sure you get the one for Fedora4!
As for only having webmin and FTP access, that might be a bit of a problem - are you sure you can't restart the ssh daemon (using webmin) and have it work? Also how much of the file system can u access through FTP - if you can access the /etc directory you could drop a statically compiled ssh or telnet or rlogin daemon somewhere, create a script in /etc/init.d to start it and then use the service control thing in webmin to start it.