Certificate error on GP access


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L4 Transporter

Certificate error on GP access

Dear Team,


I am facing the issue certificate error while accessing the GP portal. below is the screenshot.



Below is the troubleshooting steps:-

Generated a new self-signed certificate and apply in SSL/TLS.

Same certificate export and configure in the machine as well as browser.

Can anyone help me on this?


Clear the

L7 Applicator

You should generate a CA certificate and then create a new (second) certitfate signed by this CA that you can use for the portal/gateway.

Then export the CA certificate and import it into the trusted sroot signing certificates store of the user

Tom Piens - PANgurus.com
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L4 Transporter


The same i have tried but still the issue is the same.

L6 Presenter

@Jafar_Hussain  ,


Please check if your SSL Certificate CN and portal URL/IP are matching? It should match.

Mayur S.
Cyber Elite



You need to make sure that when you create certificate then certificate attributes has  hostname  field filled with FQDN.

As Chrome browser gives untrusted warning if hostname is not their in Certificates attribute.



L4 Transporter


I have configured the URL for portal access it is matched.

L4 Transporter


I want to highlight some points here.


I have observed once i open the portal in edge and internet explorer it is working fine only for some machine.

When i open portal in chrome and firefox then i am getting error.

When i checked the certificate some time is showing certificate is OK.


When i click on root CA it is shwoing below error:-




Cyber Elite


So it would appear that you have some clients that are successfully getting the root CA installed via whatever method you've chosen, but then other machines aren't. You need to look into why some of the machines don't trust the root CA certificate you are using and address that issue. 

L4 Transporter

Hi @Jafar_Hussain ,


As @BPry correctly pointed out it seems that the problematic machines doesn't have the root CA properly installed. Either it was not installed at all, or it was not installed under "Trusted Root Certificates". It is common mistake when the root CA was manually installed. During the cert installation wizard you can manually select under which section to install the certificate or let the wizard choose automatically for you. However for security reasons windows will never automatically put cert into trusted root certs.


Also have in mind that Chrome, Edge and IE are using Windows certificate store, but Firefox is using separate certificate store. So it is possible that all other browsers to work properly, but to receive cert warning from Firefox. In that case you need to install the root CA in Firefox cert store as well. 

L4 Transporter




Thanks for your email. As i explain i have configure only root CA with common name IP address and the same certificate installed in client machine trusted root certificate store.

However again i am getting the warning. the same i have checked with child certificate but not able to resolve my issue.


As per my understanding, this is a self-sign certificate from the firewall that is sometimes not trusted by the client machine so i think i need to generate CSR and sign by 3rd party which is already trusted by the client machine. i will import this certificate in firewall. might be it will fix the issue.

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