IIS is giving a 404 error when trying to download a .mst file from webserver

[Cerulean]

Greetings,

How to solve?

*IIS newbie*

EDIT: I tried adding .mst to Request Filtering for "Allow", but no dice. It was NOT already in the list to begin with.

EDIT2: IIS logs for the site has nothing but

2013-03-23 02:28:59 172.16.32.28 GET /trackitweb/installers/Remote/BMCRemoteControlGuest_en.mst - 80 - 172.16.42.194 Mozilla/5.0+(Windows+NT+6.1;+Win64;+x64;+rv:18.0)+Gecko/20130119+Firefox/18.0 - 404 3 50 31
2013-03-23 02:29:13 172.16.32.28 GET /trackitweb/installers/Remote/BMCRemoteControlGuest_en.txt - 80 - 172.16.42.194 Mozilla/5.0+(Windows+NT+6.1;+Win64;+x64;+rv:18.0)+Gecko/20130119+Firefox/18.0 - 200 0 0 31
2013-03-23 02:29:29 172.16.32.28 GET /trackitweb/installers/Remote/BMCRemoteControlGuest_en.mst - 80 - 172.16.42.194 Mozilla/5.0+(Windows+NT+6.1;+Win64;+x64;+rv:18.0)+Gecko/20130119+Firefox/18.0 - 404 3 50 31
2013-03-23 02:29:31 172.16.32.28 GET /trackitweb/installers/Remote/BMCRemoteControlGuest_en.mst - 80 - 172.16.42.194 Mozilla/5.0+(Windows+NT+6.1;+Win64;+x64;+rv:18.0)+Gecko/20130119+Firefox/18.0 - 404 3 50 15
2013-03-23 02:29:31 172.16.32.28 GET /trackitweb/installers/Remote/BMCRemoteControlGuest_en.mst - 80 - 172.16.42.194 Mozilla/5.0+(Windows+NT+6.1;+Win64;+x64;+rv:18.0)+Gecko/20130119+Firefox/18.0 - 404 3 50 31
2013-03-23 02:29:31 172.16.32.28 GET /trackitweb/installers/Remote/BMCRemoteControlGuest_en.mst - 80 - 172.16.42.194 Mozilla/5.0+(Windows+NT+6.1;+Win64;+x64;+rv:18.0)+Gecko/20130119+Firefox/18.0 - 404 3 50 15

Useless. The above paste shows when I renamed the .mst to .txt -- and yes, it did work, I could access the .txt and view the contents of the file, but when I renamed it back to .mst I received a 404 when trying to access .mst

EDIT3: No MIME Type for this extension exists in IIS. When I add .mst with MIME Type of application/octet-stream, it works!

 

[odoe]

Not familiar with mst files, but I imagine you have to add a MIME type and extension, I'm just not sure what the MIME type would be for that. I have to do similar with .less files in IIS.

 

[PTNL]

EDIT3: No MIME Type for this extension exists in IIS. When I add .mst with MIME Type of application/octet-stream, it works!

This behavior was the default behavior starting in Server 2008 (IIRC), where access was blocked to unrecognized extensions until a MIME type was defined.

 

[Cerulean]

This behavior was the default behavior starting in Server 2008 (IIRC), where access was blocked to unrecognized extensions until a MIME type was defined.

This worked fine 2 months ago. I figure that perhaps a Windows Update did this.