We have an app built with the ArcGIS Runtime SDK for iOS. One of our customers is using it behind a proxy server with content filtering. When they use a proxy filter, ArcGIS Online is refusing requests from their proxy server for public map tiles. Here is what they told me:
"What I am understanding from our filter company is that arcgisonline.com server is not taking requests from clients that are coming from our proxy filter. It is not that it is being blocked, rather the server is refusing connections from these clients. When we remove the proxy filter setting, the request works, while going through our inline filter. Here is the error provided by LightSpeed, our filter vendor."
They also provided a screen shot of the error in a terminal, and a screen shot of some logs showing that the requests are not being blocked on their end.
Any help would be appreciated.