Switch firmware upgrade has disabled web interface.
The switch is reachable but only in plain text.
express-setup.htm line
Cisco Systems
Accessing Cisco C1000-16P-E-2G-L "Switch"
Telnet - to the router.
Show interfaces - display the status of the interfaces. Show diagnostic log - display the diagnostic log. Monitor the router - HTML access to the command line interface at level 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
Show tech-support - display information commonly needed by tech support. Extended Ping - Send extended ping commands.
Web Console - Manage the Switch through the web interface.
Logout - Logout from the Device