topic Global Protect presents wrong TLS certificate of another portal in General Topics

Global Protect presents wrong TLS certificate of another portal

Trustnet-ET — Mon, 09 Dec 2019 12:59:43 GMT

I have a GP portal with TLS/SSL profile named "aaa.ssl.pr" which contains the "aaa-cert" which commons name is "aaa.com"

When accessing the portal I see a different certificate in my web browser,

If I put the same SSL profile on another test portal, I see the correct certificate.

Re: Global Protect presents wrong TLS certificate of another portal

Mick_Ball — Mon, 09 Dec 2019 14:14:05 GMT

How very odd....

the wrong certificate that you are seeing.... Is it one that's on the firewall. or have you no idea where it came from.

Re: Global Protect presents wrong TLS certificate of another portal

Trustnet-ET — Mon, 09 Dec 2019 14:46:32 GMT

It is from another test GP portal I have on the same firewall

Re: Global Protect presents wrong TLS certificate of another portal

Mick_Ball — Mon, 09 Dec 2019 14:54:41 GMT

so when you ping aaa.com, is it a different address to bbb.com

Re: Global Protect presents wrong TLS certificate of another portal

Trustnet-ET — Mon, 09 Dec 2019 15:26:10 GMT

Yes

Re: Global Protect presents wrong TLS certificate of another portal

emilta — Mon, 09 Dec 2019 15:36:04 GMT

If you have another GP gateway with no IP configured, it will take precedence and you will see it's certificate when accessing all other gateways which has IP's.

You can change the no IP gateway to a loopback with a dummy IP and the issue will be resolved.

The portal /gateway with no IP address takes priority over the portal configured with an IP address.

Ideally the GP config without an IP is supposed to be done only with DHCP IP and not static IP. So the config using IP as none is incorrect in case of static IP.

I think Palo has to alert when this configuration taking place,

https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000ClHRCA0

TLS Certificate of Global Protect portal /gw with no IP address overrides portal with an IP address
Global Protect presents wrong TLS certificate of another portal.

Re: Global Protect presents wrong TLS certificate of another portal

Mick_Ball — Mon, 09 Dec 2019 15:40:51 GMT

@emilta , great info... i was not aware of this, probably because all my portals and gateways are static.

I have read the link provided but cannot see where it mentions certificate priority, could you forward a link with this info...

Many thanks,