SSL connection from GNS3 Docker through a corporate security
Corporate security has become very restrictive. A joke is that even Pearson VUE connection test is failing from my corp laptop. One of the recent issue I had when started Practical Python Cisco Network Automation chapter from INE CCNP learning path. The built in Docker network automation container in GNS3 wasn't connecting, returning "failed to verify certificate: x509: certificate: certificate signed by unknown authority." in the logs. First help came from here https://forums.docker.com/t/tls-failed-to-verify-certificate-x509/137486 with two commands checking connection and showing certificate chain. curl -vvvv https://registry-1.docker.io openssl s_client -showcerts -connect registry- 1 .docker.io: 443 </dev/null | more Those clearly indicated that there is a issue with certificate and there is something in the chain shouldn't be there: Cloud Services Root CA by a BlueCoat Systems. The solution came from here: https://johnpfield.wordpress.com/2015/03/18/