Issue
An expired SSL certificate on the APC Network Management Card (NMC) or Rack PDU causes HTTPS communication to break. When attempting to access the Web UI, the browser displays a “Page Not Found” or “Connection Reset” error.
Resolution
Step 1: Gain Management Access
If HTTP access is already enabled on the device, skip to Step 2. If HTTP is disabled, you must use the Command Line Interface (CLI):
- SSH into the appliance using your deployment credentials (e.g., username
apc). - Run the following command to temporarily enable HTTP access:
web -h enable - Reboot the NMC to apply the changes by typing:
reboot
Step 2: Clear the Expired Certificate via Web UI
- Open a web browser and navigate to the appliance using HTTP
- Log in and navigate to: Configuration > Network > Web > SSL Certificate
- Change the configuration radio button to Remove and click Apply. (Note: This deletes the expired certificate and forces the device to automatically generate a fresh self-signed certificate upon the next reboot).
Step 3: Restore Secure Settings & Reboot
- Navigate to: Configuration > Network > Web > Access
- Disable HTTP to maintain environment security, ensuring HTTPS remains enabled. Click Apply.
- To finalize and save all changes, execute a final reboot by navigating to: Control > Network > Reset/Reboot
Note: If you are dealing with older NMC2 firmware (pre-v7.0.4), the newly generated self-signed certificate will expire again in 1 year. To prevent this cycle, consider upgrading the NMC firmware to the latest stable release branch, which issues long-life certificates.
