FTP server on my network is no longer working but had been for over a year

I set up my server (also my domain controller) to be an FTP server and initially this was working fine (for 1+ years).  Now it's not working and my "upload" program that I use from my clients computers doesn't even get past the InternetConnect function (program is written in C-language).  The error returned is 12111, which seems to have a lot of causes so I'm not sure how helpful the error code number is.  I have to assume that I have inadvertently set some of my FTP authentication settings incorrectly on my server under IIS (7.5).  Any ideas?
Jim KlocksinOwner, Data ArchitectsAsked:
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Jim KlocksinOwner, Data ArchitectsAuthor Commented:
Thanks for the suggestions.  I kept working on this while posting the question and realized, eventually, that my FTP Authorization Settings were corrupted.  So I deleted that FTP site (on my IIS 7.5) and created a new one which resolved my major problem with my FTP needs.  I use FTP to backup client databases each night (in .ZIP format) to provide an off-site backup as well as having current data on my own network.  At this point, I'm successfully "uploading" almost all of these databases directly to my own FTP server.  I do have one database that I'm having a problem with and I really don't understand it!  I'm using the EXACT same FTP upload program that works for all of my other databases, but, for some reason, fails with a 12111 error code on this database (remote AND local server are running Windows Server 2008 R2).  I realize that I'm basically asking a totally new question here, so I'll post it separately unless someone has an answer to this one...TIA
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Mark BullockQA Engineer IIICommented:
To troubleshoot, you can try logging in to the ftp server using a browser.
ftp://user:password@ftpserver/url-path
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Dan McFaddenSystems EngineerCommented:
I would also look in the FTP logs (if you have them enabled) to try to find a corresponding (timeframe) log entry that may point you towards a root cause.

You could also check in the Application and System events logs for warnings or errors relating to IIS.

Dan
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Dan McFaddenSystems EngineerCommented:
The error code 12111 is a WinInet error and means ERROR_FTP_DROPPED.  Something is causing your session to drop or abort.

Refernce link:  https://support.microsoft.com/en-us/kb/193625/

Dan
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Dan McFaddenSystems EngineerCommented:
Jim,  I will again suggest looking into the FTP logs to find the related session info and see if there is any helpful indicator for the source of the dropped session.  If you have logging enabled, you should be able to locate a corresponding session that correlates to the job that is returning a session aborted error.

Also, have you tried to manually upload the file from a command prompt?

Just trying to move along the process of trying to help troubleshoot the issue.

Dan
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Jim KlocksinOwner, Data ArchitectsAuthor Commented:
In an effort to maintain civil dialogue, I'm just going to say that I was well aware of what the 12111 error message meant.  What I'm looking for is some reason why I would consistently have this one session dropped, when I have almost 40 others that complete successfully, some of which are even larger than this specific file.  For obvious reasons, I don't believe this to be a program problem, but what I'm looking for is some guidance as to what causes a 12111 error and how to prevent it.  At this point, I really have no idea and I'm going to do some more research before I start another Q&A thread.  Therefore, I'm closing this particular question until I "come up empty" with my additional research!
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