Kindly follow the rest of the steps I have mentioned below,
Try to assign new IP to Controller B as well and check access. Need to confirm if same issue on both controllers ?
Are you able to SSH or telnet to both controllers with new IP? if not what error you get. Plase provide screenshot
Did you tried connecting your Laptop directly to management port of the controller?
Did you tried by restarting controllers?
Did you checked which Controller firmware version both controllers running from Serial console? If required update firmware with the help of FTP method. There could be some known issue which may get fix by latest firmware
Hope this helps!
Regards
Subhajit
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