Cisco AnyConnect on Linux solution to “Authentication failure due to problem verifying server certificate” error message

This is a very technical and a limited solution to Cisco AnyConnect issue with unknown certificate on Linux (Ubuntu 22.04). AnyConnect version is 4.10. I hope this post will help others with a similar problem.

The issue is around SAML authentication (an embedded web browser attempting to complete the authentication process), and its failure to pop up, with the following message

AnyConnect error message

A quick and simple solution is available, and it goes like this:

echo | openssl s_client ${ADDRESS}:443 | openssl x509 > ${ADDRESS}.crt
sudo cp ${ADDRESS}.crt /usr/local/share/ca-certificates/
sudo update-ca-certificates

This solution is from this forum post, and I only keep it as a reminder.

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