I’m using WSO2 API-Manager 4.3.0 for a project, but I’m running into a problem where the ERR_CONNECTION_RESET error appears because the APIM isn’t reachable at localhost:9443. On localhost, my backend (.NET Web API) functions perfectly.

Problem

It is not possible to access the WSO2 API-Manager portals using localhost.

Request for Help

I need assistance to make WSO2 API-Manager accessible at localhost:9443 without encountering the ERR_CONNECTION_RESET error.

What I’ve Tried

1. Windows Network Reset: Attempted to reset the network configuration.
2. Backend Shutdown: Stopped the .NET Web API backend, but the issue persists.
3. Browser Check: Tested different browsers, still encountering ERR_CONNECTION_RESET.
4. Hosts File Check: Verified hosts file entries:

   127.0.0.1    localhost 
   ::1          localhost
   

5. Ping Test: Successfully pinged localhost:

   PS C:UsersRayan> ping localhost
   Pinging MyCompany [127.0.0.1] with 32 bytes of data:
   Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
   

6. APIM URLs Check: Attempted to access various WSO2 APIM URLs through 127.0.0.1: but the Publisher and Admin aren’t working as they redirect to https://localhost:9443/oauth2/authorize(…) (not functional)
7. Callback URL Adjustment (To make the publisher and admin portals work perfectly over 127.0.0.1): Adjusted callback URLs in the Carbon portal:

   Carbon portal > Service provider list > apim_publisher edit > Inbound authentication config > OAuth/OpenId Edit > changed callback URL to 127.0.0.1 instead of localhost.
   

   This resolved redirects for publisher and admin, but it’s a workaround, not a fix.

8. Different Device Test: Confirmed functionality on another device (home desktop) over localhost, but unable to replicate on main device.

Additional Information

• Operating System: Windows 11
• WSO2 API-Manager version: 4.3.0
• Browser versions tested: Chrome, Edge, Firefox

Any insights or solutions would be greatly appreciated. Thank you!