Network issues preventing Telnet, FTP, Exceed connections.
First, let me get out of the way that I am a total Linux newb and this is my first real experience installing and configuring a server. Now onto my problem.
I just installed RHEL 5.0 and I am having issues connecting through ftp clients, Exceed xterm, and telnet from a remote client. As it stands the only type of remote connectivity I have is through an SSH Putty connection. Problems: Telnet - From Windows, when I try to Telnet to the linux box I immediately receive a connect failed message C:\>telnet xxx.xxx.xxx.xxx 23 Connecting to xxx.xxx.xxx.xxx 23....Could not open connection to the host, on port 21: Connect failed FTP - I've tried using a GUI (FileZilla) and a command window to access an FTP session but it almost immediately fails ftp> open xxx.xxx.xxx.xxx > ftp: connect :Uknown error number. When using FileZilla it immediately throws me a "Could not connect to server" error when attempting to connect through port 21. Exceed - Pretty much any connection method attempted to establish an x-window session fails upon failure to reach the host. The client machine I am using is behind the same firewall as the server. I installed RHEL through the GUI installer, and I initially configured the firewall to pass through Telnet, FTP, etc. Trying to troubleshoot, I disabled the firewall and stopped iptables but this did not help. Can someone please point me in the right direction? |
I'd also like to mention that I can make an sftp connection from another RHEL 5.0 box to the problematic machine without a problem.
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Can you nmap the server and be sure that it's listening on those ports? If it isn't you may need to start or restart the services.
nmap <server ip address> nmap 192.168.1.25 this should show all ports that the server is listening on. to restart a service: /etc/init.d/<service> restart /etc/init.d/telnetd restart |
1. check the firewall on the server with
iptables -nvL 2. telnet server is normally disabled by default due to security issues ie plain text transmission. You may need to install it yum install telnetd then go into /etc/xinetd.d and edit the telnet file, set 'disabled=no', restart xinetd service You'll need to check /etc/hosts.allow,deny files as well. Personally I wouldn't use a telnet server without a very good reason. I'm assuming Quote:
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