Postman SSL Verification Failing

Hi,

your description is confusing, because you say, that have configured the VS to do SSL Bridging, what means, that the SSL Hanshake is not terminated on the BIG-IP. This would mean, that the BIG-IP is only terminating the connection up to Layer 4 (TCP). In this case the Pool Member/Node (Backend Server) is handling the SSL Handshake and provide the certificate (chain).

I assume that you have configured the BIG-IP to handle the SSL Handshake as well, by assigning SSL Client (and Server) profiles. In this case please check if the certificate chain is fully configured in the SSL client profile. You need to select the intermediate certificate as chain certificate within the certificate selection option. If there are more than one intermediate certificate, you need to create a chain file, containing all the intermediates (use the Bundle Manager).

Now to your issue regarding Postman. I've seen many times, that customers have imported the intermediate certificates into the users certificate store. In this case the configuration on the server is still wrong, but the client wouldn't see any issue, because the chain certificates are in the certificate store and the chain can be fully resolved. I thought that Postman would use the users certificate store as well, so this is confusing. Do you connect using a name or IP address, that is matching the certificates CN or any of the SANs?

Cheers, svs