I have Cisco 9800-40 WLC and enabled http and https. It was working fine before but after few days unable to access through http and https.
Troubleshooting step taken:
1. check https and http
2. Installed new web browser like Firefox
But no luck.
Can I get help for it?
Are you able to ping WLC IP from your device?
if it was working and broken, I connect to the console run the debug and check what is the logs show. also verify any changes in the config, most related to HTTP and HTTPS config.
Then it required investigation, log in to switch see is the Physical Port, is the leaning the Mac Address in the port, is the ARP entries in the switch,
Try to shut down and un shutdown the port that WLC connected - see if that resolves the issue.
If no you need someone to physically access the WLC console and provide Logs and errors?
Is the controllers are in HA? hows the switchport configuration and also the uplink port configuration in WLC? It is recommended that you configure your switchport connecting to the wlc as trunk, no native vlan here. you may additionally configure spanning-tree portfast trunk if required. Allow only the Wireless VLAN and the managment.
It is also recommended you always configure the service port as OOB, this port is layer 3 and there is very small margin of error as no STP.
Also make sure that the ip http server and ip http secure-server are enabled and authentication is set to local, also under the line vty 0 15 login local is configured and transport input all is configured for testing purposes. Some of the above will raise some security alarms, but you may do it at your own risk.
I think the most likely problem is not the redirection ACL. The redirection ACL rules of C9800 and AireOS seem to be opposite.