Initially you have to make sure the internet is working as well as the Firefox has no error introduced in the proxy add-ons. In general if add-on is effected by Virus then on treating the virus using any of the antivirus it will create an error introduced that may have some corrupted files introduced into the connectivity network.
To fix untrusted connection error you can read the blog explains right approach to Fix Untrusted Connection Error in Mozilla Firefox. But to fix proxy server refuse connection to internet in Firefox you can read and execute below listed methods to solve the issue you can follow step by step methods listed in the blog.
METHOD1: CHECK PROXY SETTINGS MOZILLA
Step1: Open Mozilla web browser and click on three lines just below close button.
Step2: Now select the general tab and scroll down to settings.
Step3: Now select network settings button and select use system proxy settings.
Step4: Save the settings and close tabs and check if issue is resolved.
Step5: If still error occurs repeat step 1 to step3 and use No proxy settings.
Step6: If still facing issue then repeat step 1 to step3 and use automatic detect proxy settings.
METHOD2: DISABLE PROXY SERVER FOR LAN
Step1: Press windows button and type internet options and open entry internet option.
Step2: Now click on connections tab and press LAN settings button.
Step3: Now find use a proxy server for LAN to uncheck checkbox next to entry.
METHOD3: DISABLE MANUAL PROXY
Step1: Search proxy in the search box and open entry name with proxy or configure proxy.
Step2: Toggle automatic detect settings to on and manual proxy setup to off.
Users can read above shown methods by experts to solve the proxy server is refusing connections Firefox fixed by the team of experts certified to deal technical errors faced in Firefox. The certified professionals are here and to get in touch with Mozilla Firefox support phone number you can call now +1-888-311-3841 toll free.Tags: firefox proxy, firefox proxy server, my proxy server, proxy server error