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