GlobalProtect Authentication failed Error code -1 after PAN-OS update

[garry_shape]

We are on PAN-OS 8.0.6 and have GlobalProtect and SAML w/ Okta setup. It has worked fine as far as I can recall.   

However when we went to upgrade to 8.0.19 and any later version (after trying that one first), our VPN stopped working.   

The client would just loop through Okta sending MFA prompts.

On the web client, we got this error: "Authentication failed Error code -1" with "/SAML20/SP/ACS" appended to the URL of the VPN site (after successfully authenticating with Okta. 

When I downgrade PAN-OS back to 8.0.6, everything goes back to working just fine. No changes are made by us during the upgrade/downgrade at all. 

Any advice/suggestions on what to do here?

[NilsGab]

Nothing else BiljanaZafirovska

[nfranz]

Had same issue in setting up Okta. Clock difference was greater than 

max_clock_skew 60

 Set clock manually resolved "Authentication Failed" error 

(active)> set clock date 2023/07/12 time 10:40:00

[almoayedict]

we had same issue, we noticed time difference between firewall & local time.. we had changed Maximum Clock Skew (seconds) to 900 sec which is 15 min then tried to logged in & its works fine.