When you are greeted by this error: Error code: SSL_ERROR_INTERNAL_ERROR_ALERT trying to access Cisco WLC via Web GUI, you need remove trustpoint TP-self-signed-X cert, and reenable http server. This will regenerate self signed cert.

C9K5#show run | inc trustpoint TP-self
crypto pki trustpoint TP-self-signed-2997515006

C9K5#conf t
Enter configuration commands, one per line.  End with CNTL/Z.

C9K5(config)#no crypto pki trustpoint TP-self-signed-2997515006
% Removing an enrolled trustpoint will destroy all certificates
 received from the related Certificate Authority.

Are you sure you want to do this? [yes/no]: yes
% Be sure to ask the CA administrator to revoke your certificates.

C9K5(config)#no ip http server
C9K5(config)#no ip http secure-server
C9K5(config)#ip http server
C9K5(config)#ip http secure-server
C9K5(config)#ip http authentication local  

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