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Solved
WNR2020 - 403 forbidden error on Port Forwarding
When I initially setup this router, I had added one custom port forward service that works. However, now when I try to edit the existing setting I get a 403 forbidden page that opens in the main frame of the html interface. The same thing happens when I try to apply a new custom port forwarding service. I can enter the details for a new entry but as soon as I try to save it, I get the 403 page again. I'm running on the latest firmware V1.1.0.44_1.0.1. I have tried different browsers and different devices to no avail. In some browsers, I get the 403. In other browsers, I get a generic error page. In I.E., for instance, I get the error: "The website declined to show this webpage. HTTP 403. Most likely causes: •This website requires you to log in." Obviously, I am already logged in. I have not yet tried a factory reset because I use wifi access list and didn't want to set those up again, but if I have to and a factory reset will help, I'll try that.
Same problem here this month. But I had successfully set up multiple rules last year. I finally resorted to installing older versions of the firmware and found this problem begins with 1.1.0.44. So I set up the router as desired by installing 1.1.0.40, defining the required port forwarding rules, then installing the latest 1.1.0.50 - the settings were retained.
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UPDATE: Performed a factory reset. Added one port forwarding service. Tried to add a second one, 403 forbidden error. Same error if I try to edit or delete the existing service. Is this a known issue?
UPDATE#2: I found a newer firmware, V1.1.0.50_1.0.1, tried to add a port forward service, got the 403. Did a factory reset, added one port forward successfully, but got the 403 when attempting to add a 2nd. The difference now is that I can successfully delete or edit the existing service, and I can successfully add one back in, but only one.
Same problem here this month. But I had successfully set up multiple rules last year. I finally resorted to installing older versions of the firmware and found this problem begins with 1.1.0.44. So I set up the router as desired by installing 1.1.0.40, defining the required port forwarding rules, then installing the latest 1.1.0.50 - the settings were retained.