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Serv-U FTP server permissions problems

Posted on 2006-04-03
Medium Priority
Last Modified: 2013-11-29
Serv-U v6.1
XP Pro SP2
Windows Firewall enabled (exception on port 2121)
Linksys Wireless router (port forwarding on port 2121)

This is the error I am getting while trying to access the FTP server from outside the router:

An error occurred opening that folder on the FTP server.  Make sure you have permissions to access that folder.

Operation timed out

Now, when I try to hit the server from the outside (with a laptop) and simultaneously look at the server (on the desktop PC) to see what the logs say, it shows that I am logged in.  But, it never actually shows any folder.  The little flashlight just keeps searching and searching until it times out.  I thought this might be a firewall issue, but since Serv-U shows me as being logged in I am a little confused.

Is it safe to say that this is no longer a network issue, and really is a permission/file path issue?

Question by:quicksilver98
LVL 67

Expert Comment

ID: 16361206
I've found that forwarding 20-21 works best...try that under linksys & xp's firewall...
LVL 17

Expert Comment

by:Dushan De Silva
ID: 16361963
Please check your ftp protocol timeout at FTP server.

BR Dushan

Author Comment

ID: 16363362
The timeout is set to 300 seconds from what I can tell.  I actually just changed everything back to port 21 and it didn't seem to make a difference.

Also, It doesn't seem to matter whether I am inside the router or not.  It is doing this on every machine I have tried, inside the network and out.
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LVL 13

Expert Comment

ID: 16365063
Have you taken a look here??


Also, since you are seeing this inside your firewall,  check the Serv-U permissions on the default folder.  At minimum you need Read & List perms on the folder...

LVL 67

Accepted Solution

sirbounty earned 500 total points
ID: 16365901
quicksilver98 - in Linksys, forward ports 20-21.  In XP ICF, forward ports 20-21, in Serv-U, use port 21.
I have mine setup like this and it works fine...
I don't think it's permissions...

Author Comment

ID: 16366035
I gotta admit, I was a little skepitcal on sirbounty's advice, but it turned out to be that simple.  Switching back to port 21 worked.  Why?  I have no idea, but it worked.  Very strange.

Thank you everyone for your help.
LVL 67

Expert Comment

ID: 16366546
It has to do with the type of FTP you're using...known as "Active FTP".
It uses the two ports, (the command & data port, as they're also known as) to setup and initiate the transmission.

Read more, if you're curious, here: http://slacksite.com/other/ftp.html

Author Comment

ID: 16367392
Thank you sir.  That is a big help.  Especially for someone like me, who is new to the world of File Transfer Protocol.

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