Hello,
Thank you for contacting Cisco support.
My apologies for the inconvenience. Please reply to the following questions so that we can further isolate the problem:
-Did the problem start occurring ever since the switch was added to the network?
-What is the current firmware version running on the switch?
-Can you ping the ip address of the gateway?
-Can you try to access the Web GUI of the gateway with a different web browser?
-Is the PC you are using to try to access the gateway on the same Vlan as this gateway?
Please contact our SBSC phone line at: 1866-606-1866 for immediate assistance.
Have a wonderful day!