FTP problems onto NT4

[iazms]

I have two unix servers. From one of them, I am able to FTP onto a WIN NT4 server. But from the other I am not. Where could the problem lie.

I dont have much knowledge of Unix administration but can get colleagues to do the tests for me.

I am interested in the things I should be checking on the Windows side as well as the Unix side.

All three servers are on the same subnet. i have checked the firewall and port settings. All servers are able to ping each other.

 

[bi]

Is ftp server running on both NT systems?

 

[iazms]

FTP server is running on the NT system.

One of the Unix servers is able to FTP to it fine.

Second Unix server is giving an error message:

Connected to joe.bloggs.co.uk.
530 Connection refused, unknown IP address.

 

[Annihilannic]

It sounds like the Windows FTP server restricts access to certain IP addresses. You probably need to review the FTP server configuration on the Windows system.

Annihilannic.

 

[iazms]

I have tried it both ways:

By having no restrictions so that any server can access AND also by specifying the exact IP addresses of the 2 unix machines. Still to no joy.

M.S

 

[Annihilannic]

Perhaps one of the IP addresses looks up in DNS, and the other doesn't?

Annihilannic.

 

[iazms]

Sorry I dont understand what you mean?

Are you refering to the 2 unix servers? Can you be a bit more precise about what you are suggesting please.

M.S

 

[Annihilannic]

On your Windows system, at a Command Prompt, type:

nslookup 1.2.3.4
nslookup 5.6.7.8

Where 1.2.3.4 and 5.6.7.8 are the IP addresses of your Unix systems. This does a reverse DNS lookup (reverse because you are looking for a DNS name using the IP address, instead of the other way around, which is normal).

Do they both return similar responses?

You could also check whether their IP addresses are listed in the HOSTS file on the Windows system, either in C:\WINDOWS or C:\WINDOWS\SYSTEM32\DRIVERS\ETC.

Annihilannic.

 

[iazms]

Thats freaky, I was just doing EXACTLY the same tests you have asked me to do above.

When I do nslookup using the IP address, I am NOT getting a similar response.

For serverA, when i do nslookup 1.2.3.4 - i get serverA.abcd.co.uk

For serverB, when i do nslookup 5.6.7.8 - i get serverB_CD.abcd.co.uk

I dont know where the _CD is coming from, I have never heard of that. And it is serverB that is giving the problems.

I have included the IP addresses in the host file too, but I dont think that will resolve it because serverA which works was not included in there either.

 

[iazms]

I have changed the DNS server entries in TCP/IP properties on the NT box. I have then done nslookup on the IP address and this time it is returning the correct server name.

But this has not fixed the problem!

What else can it be?

M.S

 

[Annihilannic]

Since the problem is almost certainly on the Windows side you may have better luck in the Windows forum(s), or one for the FTP server software you are using.

Annihilannic.

 

[iazms]

Hey i managed to sort it, It was on the windows FTP server. Still not sure what fixed it, but basically i allowed anonymous connections. it started working, but obviously that is a security risk, so i disabled it and it still continued to work, BUT DOESNT allow anonymous connections so all sorted now.

M.S