Windows Server 2008 R2, IIS7, FTP7
Bear with me, since I am not incredibly experienced with Windows Server and IIS7. I am troubleshooting an issue with some software for a customer. Our software issues the .NET FTP.GetDateTimestamp command for an ftp request, which internally is issuing "MDTM" to the FTP server. The logs show a 500 error, command not recognized when they are running this software on an external machine. It seems that if they run the software locally on the server, there are no FTP problems whatsoever, everything runs smoothly. But when running the software on an external machine and connecting to the FTP server remotely it doesn't recognize the command. I verified this by using CMD's ftp> program to connect. When running this on the server I can issue "quote FEAT" and "quote MDTM" and it recognizes the command. When I run ftp> and connect remotely from another machine, I can issue low level commands listed by "?", but it gives back 500 errors for both "quote FEAT" and "quote MDTM".
I have been able to get this to work fine on other deployments, using Windows Server 2012R2 and Windows Server 2012, so I think this is an issue with their security configuration or perhaps permissions but I don't know what to look for. Any suggestions on where to look or at what to look?
Thanks.