SignalR long pooling disconnecting silently on IIS 7.5 and Windows Server 2008 R2

(I asked this question on StackOverflow, and it contais code I ommited here, but I think it would be suitable to ask it here aswell, since it’s a network issue I’m facing). I have an API (WebAPI) with SignalR hosted on an IIS 7.5 at a Windows Server 2008 R2 (production environment) and I connect to my hub …

Windows 2008 VPS via SignalR long pooling disconnecting silently on IIS 7.5 and Windows Server 2008 R2.