hi Arunvm, which security software are you using? please see if the steps from How to troubleshoot security error codes on secure websites help...

Check out why the site is untrusted and click the "Advanced" button to expand this section to see extra details. If the certificate is not trusted because no issuer chain was provided (sec_error_unknown_issuer) then see if you can install this intermediate certificate from another source. Click the "Add Exception" button to inspect the certificate in the Certificate Viewer.

If you can't inspect the certificate via "Add Exception" then try this:

Open the "Add Security Exception" window by pasting this chrome URL in the Firefox location/address bar and check the certificate:

• chrome://pippki/content/exceptionDialog.xul

In the location field of this window type or paste the URL of the website with the https:// protocol prefix (https://xxx.xxx).

• retrieve the certificate via the "Get certificate" button
• click the "View..." button to inspect the certificate in the Certificate Viewer

You can inspect details like the issuer and the certificate chain in the Details tab of the Certificate Viewer. Check who is the issuer of the certificate. If necessary then please attach a screenshot that shows the Certificate Viewer with the issuer.

Dear Mozill Team! Bravo! It is working fine now. Thank You So much Paul! Have a great day!

Dear Mozilla Team! Bravo! It is working fine now. Thank You So much Philipp! Have a great day!

Arunvm said

Dear Mozilla Team! Bravo! It is working fine now. Thank You So much Philipp! Have a great day!

Bravo! It is working fine!