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?
Since you are hitting the ACS URL it would appear that the firewall is sending the request, but it isn't getting anything back from Okta. I'd make sure that you don't have any traffic getting dropped between Okta and your firewall over port 443, just to verify something within the update didn't modify your security policies to the point where it can't communicate.
If communicate comes back okay you should really contact TAC and have them verify your configuration and work with you to ensure that everything is working okay. If it isn't a communication issue you'll need to start looking at packet captures and a tool like the SAML DevTools extension to see exactly what your response is and ensure that everything actually lines up.
Is TAC the PA support? If so I did send a case in.
As far as changes, would I be able to load configuration from old backup onto the newer OS to override any of those changes if there were any security changes for example?
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