The best solution is to upgrade the firmware on the device:
The S-series device can be upgraded to version 08.63.05 or higher
Extreme Management can add the weak support back in using the following:
1. ssh into the XMC server
2. edit your /etc/ssh/sshd_config and add the following line to the end of the file:
3. Save the file.
4. issue the following command to restart sshd: service sshd restart