UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36

Example URL:

Steps to reproduce the problem:
1. load https page in chromium
2. stop HTTP server
3. change HTTPS certificate
4. restart HTTP server
5. control + F5 in Chromium, open certificate viewer

What is the expected behavior?
certificate viewer showing the new certificate

What went wrong?
certificate viewer showing the old certificate. It took minutes before certificate viewer was updated. New tab/incognito were showing the new certificate.

Did this work before? N/A 

Chrome version: 63.0.3239.132  Channel: n/a
OS Version: Ubuntu 16.04.3 LTS
Flash Version: 

server side using nginx with letsencrypt(certbox). After nginx restart, the TCP connection using the old certificate has been torn down. Chromium should reflect certificate change right away, not after a certain interval.