I think that the main problem is that spamhaus and njabl.org see an open proxy port from the outside. Make sure that your proxy port is not accessable from the outside. HTTP trafic has a random returning port , standard proxy port are e.g 8080 , 3128. Dont know what you have configured , but that is the first step.

Web Application Proxy traditionally interacts with AD FS using redirections which is not supported on ActiveSync clients. This new version of Web Application Proxy provides support to publish an app using HTTP basic by enabling the HTTP app to receive a non-claims relying party trust for the application to the Federation Service. Open Proxy - ProxyMesh Knowledge Base Jul 08, 2020 Checking if an HTTP proxy is open - Nmap 6: Network

Hi Can i use a free public proxy server using opendns ?Can Umbrella deliver this please ? for example : all my web requests are sent to proxy 208.67.222.220:8080 ? Thanks

Jan 16, 2018 · There are two areas where the WSA can be considered to be an open proxy: HTTP clients that do not reside on your network are able to proxy through. Clients that use HTTP CONNECT requests to tunnel non-HTTP traffic through. Each of these scenarios has completely different implications and will be discussed in more detail in the next sections. I think that the main problem is that spamhaus and njabl.org see an open proxy port from the outside. Make sure that your proxy port is not accessable from the outside. HTTP trafic has a random returning port , standard proxy port are e.g 8080 , 3128. Dont know what you have configured , but that is the first step.

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