No we don't have a welcome page.
Please below for the captiveportal related configuration.
ip access-list session captiveportal
user alias controller svc-https dst-nat 8081
user any svc-http dst-nat 8080
user any svc-https dst-nat 8081
user-role guest-logon
captive-portal "guestnetwork"
access-list session captiveportal
access-list session guest-logon-access
access-list session logon-control
aaa authentication captive-portal "guestnetwork"
default-role "auth-guest"
server-group "Internal"
protocol-http
white-list "ocsp.usertrust.com"
user-role auth-guest
access-list session cplogout
access-list session guest-logon-access
access-list session block-internal-access
access-list session auth-guest-access
access-list session drop-and-log
!
Strange thing is that once authenticated, DNS breaks on the client device.
Have not tried a different broweser but will do so shortly.
Thanks,