Slow login with Active Directory on Ubuntu 20.04
I am running an Ubuntu 20.04 machine configured to use my organisation's Active Directory (AD) setup.
There is a significant difference in the login time depending on whether I am connected to my organisation's local network. Away from the network, login takes ~1s, whereas connected to the network it can take several minutes, sometimes even rejecting my password at first before eventually accepting it.
Presumably there is some credential caching going on when I am disconnected from the network, but this difference in login times does seem excessive.
/var/log/auth.log shows the following around a login event:
Feb 21 14:17:01 device_name CRON[16161]: pam_unix(cron:session): session opened for user root by (uid=0)
Feb 21 14:17:01 device_name CRON[16161]: pam_unix(cron:session): session closed for user root
Feb 21 14:20:04 device_name gdm-password]: pam_unix(gdm-password:auth): authentication failure; logname= uid=0 euid=0 tty=/dev/tty1 ruser= rhost= user=user_name
Feb 21 14:20:05 device_name gdm-password]: pam_sss(gdm-password:auth): authentication success; logname= uid=0 euid=0 tty=/dev/tty1 ruser= rhost= user=user_name
Feb 21 14:20:07 device_name gdm-password]: gkr-pam: unlocked login keyringThe authentication failure from pam_unix after a wait of 3 minutes seems suspicious, but I don't know enough to properly diagnose this.
Does anyone know what could be causing such long login times when connected to the AD network?
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