For a few months now I've been having this issue where sometimes content from websites are blocked. A few examples are scripts being blocked so I'm unable to log in to certain websites, on Android Studio I have to use an insecure method to download resources (or a system proxy) or it fails, some applications that require a token from online will load up my browser get the token then try to load a local page (127.0.0.1:blah) and give the message "connection refused", etc.
I've tested using different browsers, it is not a problem with a specific one, I've tried Firefox, Chrome, Chromium, Midori, and Opera. It's not an ad blocking extension as I've tried all of those browsers out of the box. It is not a problem with a firewall, I have the firewall disabled in the settings. It is not a proxy problem, I am not using a proxy, it is disabled in settings, however if I use Google's data reduction proxy on chrome it solves the issue with non-local content being blocked. It is not an issue with the router as I have no setting specific to my PC and this issue is not present on my other devices, which means it's a software problem on my elementary OS PC. I've also made sure it's not somehow a hardware issue by installing Ubuntu 15.04 and making sure the issue is not present there.
I am running Freya and I have installed quite a few programs and 3rd party PPA's, I've installed nothing specifically having to do with Firewalls, Proxies, etc. Nor have I added any PPA containing such besides possibly a broad PPA such as getdeb.
I have searched for hours on omgubuntu, linux stackexchange, etc. and have found nothing as this is a very specific issue that I cannot find the solution to.
I've also asked this question already on this stackexchange but it was deleted and I was warned that I am now in danger of being blocked. However it is a good question by the standards posted.
I have done hours of research and have not found a case similar to mine. It is on topic as it is a question regarding elementary OS that is a problem I only am experiencing on elementary OS. It is 3 paragraphs which is pretty specific. I tried to make it as relevant to others as possible but it's a very rare issue.
Any input is appreciated and hopefully posting here will help me finally solve this issue that has been plaguing me for months. If you know of a better place for me to ask this question please refer me there.