WebGUI SSL Protocol Error on Catalyst 9500-48Y4C

[baronfunke]

Working through my (very newbie) CLI syntax and wanting to double-check myself in the GUI, but I keep getting the ERR_SSL_PROTOCOL_ERROR when connecting. 

I set the IP and subnet of the management port, it's pingable, I even get redirected to the 'webui' subfolder, but getting stopped. 

I've tried all browsers, multiple computers, clearing caches, nothing seems to work.

Also updated to current supported OS (17.12.04), which erased the old config (which is a blessing in disguise), but no luck.

I did also notice that I only have the SLA-TrustPoint PKI certificate chain installed, none of the self-signed certs, so maybe that's the culprit?  I was able to get on the WebGUI when I initially installed it (in 2020), but no luck now.

[Flavio Miranda]

@baronfunke  

 what about HTTP? 

Make sure you have  " ip http server" command for HTTP

For HTTPS, you may reset the HTTP server by using 

no ip http secure-server 

and 

ip http secure-server

check the interface the switch is using for web

ip http client source-interface  XXXX

check if everything is up and running with

sh ip http server all

[MHM Cisco World]

Can you share config of SW

MHM

[baronfunke]

Sorry it took so long for a reply, but finally got everything re-stacked and digging in to this obstacle.   I did the "shut/no shut" on http-sercure server, but couldn't get "ip http client source-interface XXXX" to work, as I wasn't sure which interface to put in there (I haven't tagged anything specific to be using the web portal).

I've attached my current config