I have a Windows Server 2008 r2 installation with configured FTP and IIS.
If I upload through FTP two files: "test.txt" and "test.abc" and then try to access these files through HTTP, then I can access only test.txt - then trying to access test.abc. results in 404.
I found this link: File Name Extensions
I followed the instructions to edit the Request Filtering. And denying works - if I set to deny ".txt" extension, then trying to access test.txt results in the same 404 error. But I don't manage to allow ".abc", adding it as allowed extension doesn't seem to have any effect.
Is there some other place where I need to make changes too in order to be able to access the file through HTTP? If I uninstall "Request Filtering", will then all files be accessible through HTTP?
Now I removed Request Filtering altogether and rebooted the server - but without change - accessing the ".abc" file still gives 404. I'm connecting to this server through a VPN tunnel. Is it possible that VPN filters out such requests and returns 404 instead?