After 90 days, the password for the 5480 port expires and you need to change it.
To do this, we will need console access to the VCSA.
Authenticate using the expired root password at the VM prompt, and choose Troubleshooting Mode Options:
Use a SSH session to authenticate with the vCenter
Once authenticated, do:
If running this command
chage -l root
Gives you this output, a password change is needed
And change the password.
Disable SSH again if needed.