After upgrading to Spectrum 10.4.2.1, users are no able to ssh to Cisco ASR 9K router models.
The following error is seen in the router logs:
RP/0/RSP0/CPU0:Dec 8 07:34:56.930 CET: SSHD_:%SECURITY-SSHD-6-INFO_GENERAL : Incoming SSH session rate limit exceeded
Release : 20.2.x,21.2.x
Component : Spectrum Core / SpectroSERVER
The default value of 60 for the "ssh server rate-limit" on the device is too low.
Increase the "ssh server rate-limit" configuration on the device to 120 or higher.