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Failure can occur due to maintenance, hardware issues, software problems, or other technical issues. Network issues: Unstable network connections, packet loss, or other network problems can cause communication disruptions between the proxy server and the upstream server.
Problem with your editing or Wikipedia behavior (under any account or IP address) - your account or a connected IP has been used in a problematic way or there is a concern about your editing. Problem with your username - your username was unsuitable and has been blocked; you need to choose another before continuing.
The requested resource is available only through a proxy, the address for which is provided in the response. For security reasons, many HTTP clients (such as Mozilla Firefox and Internet Explorer) do not obey this status code. [10] 306 Switch Proxy No longer used. Originally meant "Subsequent requests should use the specified proxy."
If one is drastically different from the others, remove it and change your password. Be aware that there are some legitimate reasons why your history can show unfamiliar locations, such as your mobile device detecting the wrong location or Internet provider using a proxy server.
Port scanning, and nmap, may help to identify which ports are open on suspect IPs, however, even when it says that proxy ports are open the default scan does not check to see if it is an open proxy using that port. It could be a closed proxy expecting authentication, or even a normal website.
Caching of proxy auto-configuration results by domain name in Microsoft's Internet Explorer 5.5 or newer limits the flexibility of the PAC standard. In effect, you can choose the proxy based on the domain name, but not on the path of the URL. Alternatively, you need to disable caching of proxy auto-configuration results by editing the registry. [7]
If the proxy server is unable to satisfy a request for a page because of a problem with the remote host (such as hostname resolution failures or refused TCP connections), this should be described as a 5xx Internal Server Error, but might deliver a 404 instead.
Syntax error, command unrecognized and the requested action did not take place. ... Failed security check. 536: Data protection level not supported by security ...