I am using ubuntu 20.04.1 and installed the cockpit from the official backport. Cockpit login page loads (even if I put in wrong credentials it shows [Wrong user name or password]) but when I put the correct username and password, the login page reload itself.
below is the syslog
cockpit-ws[3405]: cockpit-ws: Failed to open certificate file /run/cockpit/tls/e3b0c44298fc1c149afbf4c8996bb92427ae41e4749b934ca495991b7852b855: No such file or directory
cockpit-session[3423]: **pam_ssh_add: Failed adding some keys**
cockpit-session[3423]: pam_unix(cockpit:session): session opened for user john by (uid=0)
systemd-logind[911]: New session 5 of user john.
systemd[1]: Started Session 5 of user john.
polkitd(authority=local)[900]: Registered Authentication Agent for unix-session:5 (system bus name :1.38 [cockpit-bridge], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
cockpit-ws[3405]: User john logged into session 5
cockpit-ws[3405]: cockpit-ws: Failed to open certificate file /run/cockpit/tls/e3b0c44298fc1c149afbf4c8996bb92427ae41e4749b934ca495991b7852b855: No such file or directory
And web browser console shows,
(index):265 GET http://as400i.com:9090/cockpit/login **401 (Authentication failed)**