If you are able to ping IP then there is no issue with management access of the MSA controllers. It could be issue with something else like Web browser or your management system.
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 with different browsers?
Did you tried different system or Laptops?
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
Hope this helps!
Regards
Subhajit
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