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New Member

Catalyst 3750 Web Interface Broken

On a WS-C3750X-24 running software version 12.2(55)SE5 when I try to access the web administration interface with Firefox 17ESR, all I see is an empty 3x4 table with a blue-grey bar at the top and four icons in the first column: a green speech balloon with a check mark in the first and last row, and a yellow triangle with an exclamation mark in the second and third row. No text, no logo, no buttons, no links, no nothing. The yellow triangles link to a page /setup_report.htm but clicking on them just displays the same page again. It doesn't matter if I try http or https.

If I try to open the same page with https in Internet Explorer I get a "This page cannot be displayed" error with the usual unhelpful suggestions. With http, IE thinks for a few seconds, mis-autocorrects the URL by prefixing it with "www." and then displays a blank page.

Apart from that, the switch works fine. I can access and manage it via SSH without a problem. It doesn't log any errors.

What can I do to get the web interface to work?



  • LAN Switching and Routing
Everyone's tags (3)
VIP Super Bronze

Catalyst 3750 Web Interface Broken

Login to the switch via SSH and add these commands:

ip http secure-server

ip http server

and test again using the GUI.


New Member

Catalyst 3750 Web Interface Broken

Hi Reza,

thanks for your answer.

The two commands were already in the startup and running configs. I re-entered them nonetheless. Now when I try to access the switch via https, Firefox complains: "Your certificate contains the same serial number as another certificate from this certificate authority. Please acquire a new certificate with a unique serial number. (sec_error_reused_issuer_and_serial)"

The behaviour with http is unchanged.

I also turned both options off ("no ip http ...") and on again. This made no difference.



New Member

Hi Tilman, I acutally have

Hi Tilman,


I acutally have the same problem with the software version 12.2(55)SE8. Did you find a solution during the last year ?