Upgrading the Management Center (MC) v 1.11.x to a newer version. The protocols supported for this are HTTP and HTTPS.
Choosing HTTPS schema returns an error.
Management Center# installed-systems add https://220.127.116.11/uploads/bccm_2_0-219045.bcsi
Enter server username (optional): username
Enter server password: password
Download URL: https://18.104.22.168/uploads/bccm_2_0-219045.bcsi
Downloaded bytes: 0
Download failed (connection error or malformed URL)
The SSL handshake failed as the server certificate validation has failed.
The server certificate is either:
As an immediate workaround, you can use HTTP in the upload command. This implies that you need an HTTP server to host the file.
To fix the server certificate error do a packet capture on the server and find out which of the above causes the SSL handshake to fail.
Follow Create a signed certificate for the management interface in Management Center (MC) to upload the missing certificates in the chain (Step 7).
Note: You can host the image on Management Center, however you will run into the same issue unless you enable HTTP access to Management Center,
(config)# security http enable
Then upload the image to Management Center as a file, change it's file type accordingly and change the url to the format http://mc ip:8080/image
Be aware enabling HTTP access is a security risk.