I am working on a site that I'm writing that is hosted on a server outside my network (DMZ).  I am able to browse to it by IP and have Administrator access to it. I can create a New Website, edit it, compile it, debug it, everything just perfect.

 One of my other programmers opens the site through "Open Website", navigates to the \\servername\share\inetpub\wwwroot\projectfolder and it opens ok.  Now, when they try to open it / build it / debug it, they can get one or more of a ton of different errors.

A.  The specified network name no longer exists.  (this appears when you try to open a file, it goes away after a time or two of trying to open a file)

B.  The server cannot access the application directory.

C.  ~ does not exist or is not accessible because of security settings ~

D.  Failed to start monitoring changes to... 

I got all these errors in a single 3 minute span trying to do different things.  If I tried the same thing (debug for instance), I'd get B, C, and D, interchanging, seemingly at random.  A happens only when trying to open a file (100% of the time the first time i access a file, about 50 - 60% after that)

Also, if I have Project1 open from the wwwroot folder and the other developer has Project2 folder open as well (two different applications in IIS, both under wwwroot) we both start getting tons of "This file has been changed, would you like to reload it", even though we're working in separate folders.  Confusing.

I've searched all over here and haven't found any solutions or anyone that has had similar issues.  Would anyone care to take a stab at what might be happening here?

Thanks! 

Network shares are not considered trusted locations. Therefore loading assemblies from shares will fail for security reasons. Try either opening site via http:// or use caspol.exe to adjust security policy.

I guess what's confusing me the most then is that it works perfect from my machine, but not at all on another which is configured exactly the same, with the location mapped the same, with both of our user account's permissions set up identically on the remote machine. 

Security policy is set per machine, so perhaps it is different. In any case - working off UNC shares is not something that is supported really.

Are unc shares treated the same as mapped drives then?

 What would a workable solution be for this scenario?  We have 4 web servers.  Each of these host anywhere from 20 - 50 websites at a time.  Each site is setup in about a day (generated from a tool we wrote) and are "live" for about 2 or 3 weeks.  During their lifecycle, there a numerous tweaks and changes.  Hence, it's a real drag and not very efficient for us to have a "development" version locally (as a site can be edited from any of the 6 of us developers over its life) and a live production version.  So, we have each IIS root folder on the 4 servers mapped and we use the File System option to open/create new sites.  If we use Http to do this, it's slower, requires the Server Extensions to be installed on the servers, and we can't use the neat VS2k5 localhost debugging.

fyi:  we've been developing these sites in classic asp, using interdev 6.0 for about 10 years, and I finally convinced the powers that be to upgrade our process to c# and use vs2k5/2k8.  I've got our code updated, now I just need to get a workable solution to make the process efficient for our developers.

A.  Is there a better option for us?

B.  what options would i pass to caspol to allow me to have full trust from these mapped drives, if this is the best way to go?