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Can not connect to FTP from inside SMB network

Posted on 2011-03-01
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Last Modified: 2012-08-13
A very annoying problem: I can not connect to FTP server from inside SMB network.
The server is Small Business R2 2003, and I have turned off all firewalls (on DSL modem, provider, and Server).

Here is FileZilla fragment:

Status:      Resolving address of XXX
Status:      Connecting to XXX:21...
Status:      Connection established, waiting for welcome message...
Response:      220---------- Welcome to Pure-FTPd [privsep] [TLS] ----------
Response:      220-You are user number 4 of 50 allowed.
Response:      220-Local time is now 13:20. Server port: 21.
Response:      220-This is a private system - No anonymous login
Response:      220-IPv6 connections are also welcome on this server.
Response:      220 You will be disconnected after 15 minutes of inactivity.
Command:      USER XXX
Response:      331 User XXX OK. Password required
Command:      PASS *******
Response:      530 Login authentication failed
Error:      Could not connect to server

And it won't connect with any of the protocols.

Any ideas?
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Question by:mrmut
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LVL 8

Expert Comment

by:subhashchy
ID: 35006477
filezila log says 530 Login authentication failed, Can you please make sure the username and password once again and try login in from command prompt using same password
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Expert Comment

by:wfcraven12
ID: 35006654
Make sure whatever username you're using, that they have access to the actual folder itself.  So go into Windows Explorer & drill down to the FTP folder.  Go to the properties of that folder & make sure the username you're trying to connect with is listed.
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Author Comment

by:mrmut
ID: 35006676
subhashchy: yes, Ive thought that might be the problem, but the problem is that the credentials are OK. I am testing for two days now.

wfcraven12: I've just tried to connect to the FTP with my computer (outside LAN), and it worked flawlessly over Internet Explorer. There is also a file on the FTP, and it is listed and dled OK.

I also contacted the hosting company, and they tell me it is all OK from their side.
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Expert Comment

by:wfcraven12
ID: 35006761
are you trying to connect to a name (i.e. ftp.company.com) or IP address?
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Author Comment

by:mrmut
ID: 35006893
Tried it, it is the same.
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Expert Comment

by:wfcraven12
ID: 35007323
what do you mean tried it? what is the same?
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Author Comment

by:mrmut
ID: 35007799
Tried it with IP address, hostname, checked credentials, etc.
The response inside the network is always that credentials are not ok, but from external machines it works nicely.
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LVL 8

Expert Comment

by:wfcraven12
ID: 35008660
that's weird.  have you tried using COMPUTERNAME\username for the user while on the internal LAN? It may think you're trying to connect as DOMAIN\username.
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Author Comment

by:mrmut
ID: 35010437
I don't think it is that. I try to connect with Filezila and it doesn't workl either form the server or the PCs.

I am really puzzled here, don't have any idea what to do. It is irritating.
0
 

Author Comment

by:mrmut
ID: 35024883
Bump!

What could I try? Is there a win service that could block FPT? I really don't get it, as in other locations I have not problems like this one.
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Expert Comment

by:wfcraven12
ID: 35027107
Right I understand you're connecting with Filezilla, but did you at least try putting the COMPUTERNAME\username as the login ID?

Have you tried connecting with a different client (i.e. WinSCP)?

Have you tried connecting internally with Windows Explorer?

Please try with a different client as well as Windows.  It'll help eliminate variables.
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Author Comment

by:mrmut
ID: 35027254
Tested it, router does not block FTP, and I have tested FTP server internally - it works.
It seems that the server is the bottlenec, but it seems I can't find it.
Is there a service to check that might block it? - I am pretty sure there is something except firewall (turned off) that might be blocking it.
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LVL 8

Expert Comment

by:wfcraven12
ID: 35027367
A bottleneck wouldn't cause you to get an authentication error.

Have you tried connecting to your FTP server with a different client?

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Accepted Solution

by:
mrmut earned 0 total points
ID: 35028517
Solved the problem by stopping and disabling "Application Layer Gateway" service.
It works flawlessly now.
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Author Closing Comment

by:mrmut
ID: 35067721
This worked. Need to do this on clients and server.
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