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Special Forums IP Networking FTP connection problem
# 1  
Old 08-27-2002
Network FTP connection problem

We have moved our DNS and DHCP to Windows 2000 from BIND. Our FTP Server is running Solaris 2.6, users who receive an i.p. address from win2k DHCP receives a connection failed error when trying to FTP and users who have static i.p. address can FTP with no problems. Can anyone shed light as to why this would happen?
# 2  
Old 08-27-2002
From one of the system that cannot ftp, try to ping the ftp server by ip address. Does that work? If so, try to ping the ftp server by name. Does that work?
# 3  
Old 08-27-2002
I can ping by name and I can use nslookup to find the server. It appears that if Windows 2000 DHCP issued out the i.p. our Unix FTP server refuses the connection
# 4  
Old 08-27-2002
What ftp daemon are you running? Some of them try a reverse dns lookup to get the hostname. From the server can you do a nslookup on the ip address of the client? When the clients switched to dhcp did they wind up on a different subnet? Could you be running tcp wrappers or something like that on the server? Is there a firewall between the server and the client? This could be a firewall issue.
# 5  
Old 08-27-2002
We are running inetd.conf (1m) 1.2.7 SRV 4.0.1.5
Yes I can do a nslookup back to the client from the FTP Server
I not sure if we are running TCP wrapper or not but from what I can tell we are probably not, this is all I see when I check inetd.conf file: ftp stream tcp nowait root /usr/bin/in.ftpd
The dhcp client are on the same subnet as the Unix box
I am also having problem telneting into that Unix box as well.
# 6  
Old 08-27-2002
Check your /etc/hosts.allow and /etc/hosts.deny - you are probably being blocked because of the change in IP addresses. Add the new subnet to /etc/hosts.allow and it should work.
# 7  
Old 08-27-2002
The subnet range was in the host.allow, typed in the ip address of the client that was failing. Still no response, it connects to the port 21 and receives a message that "host lost connection". There is no deny.allow file.

When looking at DHCP, if I grab an i.p. address out of the range of ip address that has not been assigned by DHCP and hard code it into my workstation I can connect with no problem. But if I set DHCP up to send the i.p. by reserving the mac address it fails. Is there some type configuration in Unix that can distiquish if an I.P. address was sent via DHCP. As you can tell I am not a Unix expert just a beginner. But I appreciate all the response you are giving.

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