networking problems with ftp,telnet, ssh, http


 
Thread Tools Search this Thread
Operating Systems Linux Red Hat networking problems with ftp,telnet, ssh, http
# 1  
Old 04-25-2009
networking problems with ftp,telnet, ssh, http

I have following problems with RHEL 5.2 Desktop installation

ftp, telnet, ssh and web are not working. Web browser tries to connect to host but eventually fail with timeout. ftp, telnet and ssh simply hung, nothing happens. Basically all protocols will end up in timeout.

ping, nslookup and traceroute works fine, so the network should be OK. Firewalls are and SEllinux diabled. Services should be installed and active.

If I monitor net traffic after any of those commands there are packages send and received. So the traffic is there but nothing happens Smilie

Any ideas how to solve this?
# 2  
Old 04-26-2009
Ping and traceroute are ICMP based, nslookup queries DNS, so UDP is involved (most likely) and it's likely that you will receive some response. So, if I got this right, you cannot establish any kind of session, in order to transfer some sort of data, whether via web or SSH. You can easily start debuggin SSH for example, or telneting to a public site, and see what exactly happens. Also, it is good that you've ruled out firewalls and SELinux, but sounds like your IP address isn't set correctly in some way. How did you configure your network settings, DHCP ? Also, you need to talk to your network / system administrator to check for any administrative prohibition of access onto your core/edge network equipment for your parcticular IP or VLAN. Are there any proxies involved ? Do you have root access on that machine, so that you can troubleshoot better ?
# 3  
Old 04-26-2009
Hi,

Thanks for your answer sysgate. Youīve got it rigth, I canīt establish any data transfer session even though network connection seems to be OK. Here some answers to your questions.

1) Iīve tried to SSH, telnet and ftp several public sites. All these programs just hault, they seem be waiting some response that never comes. The process go to 'idle' state very soon after execution, network monitor shows some send/receive activity.

2) Network settings come from DHCP. IP address looks to be OK. I tried to disable ipv6 also but it didnīt help.

3) No proxies involved, direct connection to internet using Zyxel ADSL/WLAN box.

4) I have root access.

5) I have MS Vista installed also in the same machine. It setups the network automatically and connecto to internet without any problems.

6) I tried RHEL 5 server version too, no success

7) After RHEL I decided to try Fedora 10. Setup was done the same way and everything works fine eith it. The settings seem to be pretty much similar, the only differences Iīve found so far is that in Fedora the HOST name in prompt is 'localhost' as in RHEL it's 'DHCPPC'. Fedora also has xinetd.d service available that were missing form RHEL installation. That might be the reason?

I think I go with Fedora for a while and take copy of itīs config files for comparison before trying RHEL again.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. AIX

PING to AIX works but TELNET FTP SSH doesn't work

root@PRD /> rsh DR KFAFH_DR: protocol failure due to unexpected closure from server end root@PRD /> telnet DR Trying... Connected to DR. Escape character is '^]'. Connection closed. root@PRD /> ftp DR Connected to KFAFH_DR. 421 Service not available, remote server has closed connection... (2 Replies)
Discussion started by: filosophizer
2 Replies

2. IP Networking

http over ssh tunnel using multiple hops

Hello, I got an application on a linux server that I would like to access using https and a URL. I would like to create a ssh tunnel. But, let's say the app is on box C, but box C can only be accessed through box B, that can be accessed only through box A. I would like to create the ssh tunnel... (0 Replies)
Discussion started by: Pouchie1
0 Replies

3. Linux

uid of an account which accesses ftp/http

Hi Techs, Please guide me the answer with the explanation. Q1) What is the uid of an individual account which can access ftp/http? Thanks in advance to all. (3 Replies)
Discussion started by: ajazshariff
3 Replies

4. Shell Programming and Scripting

How to download X bytes from a file using ftp or http?

Hi, I have a simple ftp shell script which can download the entire file, however I want to know if there is anyway that I can download only the partial content, say X bytes from a file. If so, how I can do it using ftp and http.. Here is my sample script #!/bin/sh HOST='xyz.com' ... (5 Replies)
Discussion started by: learn more
5 Replies

5. AIX

Problems with SSH / telnet

Hey, I have upgraded 3 servers from SSH Tectia 4.0.3 to SSH Tectia 6.0.2. 2 of them are working fine but one server suddenly began to have troubles after about 2 hours. Now it is impossible to login to this server using SSH and even telnet. When SSH is running on this particular server, the CPU... (20 Replies)
Discussion started by: Hille
20 Replies

6. Solaris

Can ftp but not telnet/ssh/rsh

Hi , I have a Solaris 9 machine in which I can ftp but telnet/rsh/ssh is not working, although it was working before. I cannot also log in through the console. I get the banner for telnet but it kicks me out. Any ideas? rte (2 Replies)
Discussion started by: run_time_error
2 Replies

7. UNIX for Dummies Questions & Answers

Problems with telnet.

Hi Guys! I'm trying to connect to a regatta IBM (Sun 5.8) from my recently installed Sun Blazer, but I got the following: % telnet regatta Trying 167.164.87.8 Connected to regatta Escape character is '^]' Connection closed by foreign host % Do you have any idea what the problem is?... (2 Replies)
Discussion started by: cordobapablo
2 Replies

8. UNIX for Dummies Questions & Answers

Problems with Telnet

Hi everybody I already have installed Linux Red Hat FC4 in two machines into the same net using DHCP in both of them, the network interface are working fine cuz i can surf in Internet in those machines The problem is i need to do a Telnet from one host to the other, the xinetd and telnet... (1 Reply)
Discussion started by: Lestat
1 Replies

9. UNIX for Advanced & Expert Users

how to know how many user's connected to ftp and http server

i need to write a program to know how many users are presently connected to my ftp server and http server . i need to keep a count of this and this count should be available to other different software . how to make this GLOBAL so that other softwares can access this count value (7 Replies)
Discussion started by: hariprasad
7 Replies

10. UNIX for Dummies Questions & Answers

Networking Problems On Linux

HI I JUST INSTALLED LINUX 7.0 ON MY COMPUTER AND IT WIPED OUT THE WHOLE WIN2K SO MY QUESTION IS THAT I CAN'T .....MY NETSCAPE NAVIGATOR DOESN'T WORK (NO INTERNET AT ALL) WHAT SHOULD I DO!... I HAVE A CABLE MODEM IP I USE TO SEARCH THE INTERNET WITH BOTH BROWSER IE AND NETS..NAV.. NOW I... (1 Reply)
Discussion started by: IMOTEB
1 Replies
Login or Register to Ask a Question