FTP Site Won't Allow Login

Our FTP site was configured and running fine until last week.  Anyone attempting to login to it externally gets the login prompt and then when they input credentials it seems to time out and displays "the connection to the server was reset while loading page."  I've checked permissions on both the share and in IIS and everything looks fine.  I've stopped and restarted the FTP service and IIS.  Any ideas where I can check next.  I've looked at everything obvious but I'm sure I'm missing something simple.  Oh and the router is fine too....correct port is open in the firewall so that's not the issue.
rohnlawadminAsked:
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troubleshooter141Commented:
Have you checked the account used to login to make sure it hasn't expired?
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rohnlawadminAuthor Commented:
Yes.  I verified it wasn't locked out and I've even tried logging in as an internal user and that gives the same result.
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unogeekCommented:
Sounds like you need to reboot your ftp server. Had the same issue a few months ago and that did the trick for me. Oh, before doing that, did you check your event viewer logs?
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DileepanCommented:
have you tried connecting to the ftp service from the host machine? Some thing like 'ftp localhost'? Is there a firewall running on the host machine?
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rohnlawadminAuthor Commented:
This problem started after a recent server reboot.  There's nothing in the event viewer logs that is helpful for this issue.  I'll try rebooting again.
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troubleshooter141Commented:
a couple of things to check here:

Is the FTP service running? go to start, run, type services.msc and look for the ftp service. Is it started?

Also, if you right click on mycomputer, select manage, internet information services, ftp sites. Is your ftp site showing as running?
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rohnlawadminAuthor Commented:
Yes, it is running.  It accepts the logon credentials and then just seems to timeout after that.  If I check current session data in IIS, it even shows the session but the end user never gets access to the files on the FTP site, it just stays showing "connecting" at the top and then times out.  
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rohnlawadminAuthor Commented:
This is what the log file shows but I don't know how to interpret it:

16:01:03 208.84.199.82 [41]USER anonymous 331 0
16:01:03 208.84.199.82 [41]PASS IEUser@ 530 1326
16:01:03 208.84.199.82 [42]USER ftpuser 331 0
16:01:03 208.84.199.82 [42]PASS - 230 0
16:01:03 208.84.199.82 [42]CWD / 250 0
16:01:23 208.84.199.82 [43]USER ftpuser 331 0
16:01:23 208.84.199.82 [43]PASS - 230 0
16:01:23 208.84.199.82 [43]CWD / 250 0

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DileepanCommented:
These could be possibly the reasons
1. The FTP folder to which users are mapped to does not exist OR the user does not have any permissions on the folder
2. The IIS FTP Server timeout is set to a small number
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rohnlawadminAuthor Commented:
I verified the home directory exists and is set up properly.  Everyone has full permissions and I've tried more than one user account and they all give the same result.  Also increased the timeout to 360 from 120 and that didn't resolve it either.  It's doing something wrong after the authentication part because the IIS server sees the session as established and connected, it's just the end user doesn't end up seeing the contents of the directory.
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rohnlawadminAuthor Commented:
I also double-checked the permissions on the share, the folder itself and in IIS and all of the permissions show as full control for the user accounts I am testing with.
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rohnlawadminAuthor Commented:
A server reboot did not fix the issue either.  I'm stuck!
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rohnlawadminAuthor Commented:
I am reviewing the codes in the log as per http://support.microsoft.com/kb/318380.  All of the codes in the log don't point to anything being wrong.  There are no 426, 530 or 550 codes and the codes that are logged show successful login.  What would make it login but not display the folder contents if the permissions are correct?
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unogeekCommented:
What about your firewall logs? Did you try temporarily disabling the firewall and test from the outside?
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rohnlawadminAuthor Commented:
Yes I've tried that too.
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DileepanCommented:
Perhaps a last step, why not re-install IIS server? I would suggest you go over this http://support.microsoft.com/kb/302573 before doing so. This tells you how to backup IIS settings. You will be able to restore the settings once re-installed.
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troubleshooter141Commented:
At this point I would suggest the use of Wireshark to see what response you might be getting on the client or use sysinternals Process Monitor. If this is some sort of permissions or authentication problem, these should help you discover the issue.
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