Unable to sign-in to VMware vSphere VCenter

[ITMgrWynne]

I am getting a username and password are required error. I have put in the correct username/password, as that has not changed in a very long time. Any ideas how to get past the login screen? Screenshot attached.

[amohammadimir]

Try different web browser or use Chrome’s Incognito/Firefox Private mode and check whether login is possible or not.

If the answer is yes try to clear web browser cookies.

[ITMgrWynne · Accepted solution]

The issue was our certificate was expired. We have renewed the certificates on  vCenter and fixed the login issue.

As a recommendation, you can add email notification for alarms.

Reference links:

Check STS certificate:
https://kb.vmware.com/s/article/79248

Renew STS certificate:
  https://kb.vmware.com/s/article/79263?lang=en_US

Check Solution user certificate validity:
  https://kb.vmware.com/s/article/2111411

Renew Solution user certificate
  https://kb.vmware.com/s/article/2112283
 
Configure email for an alarm
  https://kb.vmware.com/s/article/2123925