Sponsored Content
Top Forums UNIX for Beginners Questions & Answers Unable to connect to a server from our AIX server via FTP Post 303044394 by Neo on Thursday 20th of February 2020 08:25:07 AM
Old 02-20-2020
Quote:
Originally Posted by Bruno2020

Can you tell me how to open port 20? Do i need to modify anything in the /etc/services file ?
Bruno,

You do not need to worry about port 20 (yet). That line of thinking is leading you off track (sorry Rudi) because you need to establish you have a working route (network connection) between your private IP address space and the Internet. What you are describing (so far) is just a simple network configuration issue.

You cannot ping your ftp host. ping does not use ports. The ping protocol works at the transport layer.

Quote:
There is no TCP or UDP port number associated with ICMP packets as these numbers are associated with the transport layer above.
So, if you cannot ping, you can do nothing (unless ping is blocked by a firewall rule, but then you have other problems, and you are not ready for that yet) .... on any of the ports from 1 to over 65,000 (65,535 TCP and 65,535 UDP ports, to be exact), open or not, LOL. You can open port 20 as wide as a truck and you will still not be able to connect to it; because you have described basic networking issues. You cannot ping at the transport layer (yet).

Since you can ping your own interface (that is good news, at least) , you need to try to ping the next hop on your network (normally your router, but you have not provided a diagram. Please upload a sketch as I mentioned, using the attachment feature of the site, not an external img hosting link).

Do you know what the IP address of your router is?

Also, can you run the arp command on your computer?

Try:

Code:
$ arp -a

That is the next step.... you need to see if you can or cannot connect (ping) the next hop in your network.

You are getting "ahead of yourself" if you try to work / troubleshoot at the TCP or UDP layer before you make sure you are good to go lower in the stack (at the transport layer).

That is why we need to establish you can ping first.

Understand yet? To troubleshoot networking issues, it is best to start at the bottom and work your way up the protocol stack (not the other way around). If you learn to troubleshoot like this, you will find it much easier and much faster to solve problems, I promise.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

ftp script not able to connect to ftp server.

I have the following ftp script to get files from a remote location. However, on running the script I find that I am not even able to connect to ftp server. I am able to connect to ftp server using other GUI ftp tools like WS_FTP using the same IP. IP used here is a dummy IP. What can go... (3 Replies)
Discussion started by: gram77
3 Replies

2. AIX

Unable to connect to AIX server through xmanager

Hi, I have xmanager installed on my windows PC. But I am not able to connect to AIX server. It's giving the error as follows: The X11 forwarding request was rejected. Graphics mode is not coming up in AIX server. Please help as I have to install oracle patchset urgently. (1 Reply)
Discussion started by: dwiravi
1 Replies

3. HP-UX

[Solved] Unable to rename file in ftp server .Net:FTP perl

Hello All, I am trying to connect to ftp server and get the files. Also i need to rename the file in other ftp dir. rename method is not allowing me to rename the file in other dir. When i tried copy command by using net::FTP:FILE then perl says it is not installed. Can some body help me to... (2 Replies)
Discussion started by: krsnadasa
2 Replies

4. UNIX for Advanced & Expert Users

Unable to use FTP command to connect from one server to another

Hi, I have two unix servers A and B. from A i am trying to use the ftp command to connect to B but I am getting the "ftp: connect: A remote host refused an attempted connect operation." I checked the following things : 1.) Unix Server details for A and B after running the command uname -a... (3 Replies)
Discussion started by: mick_000
3 Replies

5. Red Hat

unable to connect remote server using ssh

hi all i am unable to connect remote server using ssh but i am able to ping the server ssh service is running. (5 Replies)
Discussion started by: nikhil kasar
5 Replies

6. Linux

Generate public key to connect from one ftp server to other server

How to generate public key to connect from one ftp server to other server to use in scripting. (0 Replies)
Discussion started by: sridhardwh
0 Replies

7. UNIX for Advanced & Expert Users

Public key to connect from one ftp server to other server

How to generate public key to connect from one ftp server to other server to use in scripting. (1 Reply)
Discussion started by: sridhardwh
1 Replies

8. Linux

Unable to connect to Server machine from a client machine using ftp service

Hi, Could you please help me with the below issue.. I'm running RHEL6 OS on both server (192.168.0.10) and client machines (192.168.0.1). I'm trying to connect to server from the client machine using ftp service. I have installed vsftpd daemon on both the machines. I'm getting... (4 Replies)
Discussion started by: raosr020
4 Replies

9. Solaris

Unable to connect sun server.

Hi, I am unable to connect sun server, server model is sun fire v440 on server 2 ports are there. serial management, and network management. I would like to know how to connect serial port if I dont have com port on my system? and on Network Management no ip address is configured. ... (2 Replies)
Discussion started by: manoj.solaris
2 Replies

10. Shell Programming and Scripting

Not able to connect to new FTP server

Hi All, We have done new FTB setup. I am not able to to connect to this new target server. Here is the new setup to send files to the FTB : - Login : FTB-TAN-DEV-SAP - Protocol : SFTP - Port : 54322 - Hostname : ftb-dev.apj.hp - Env : DEV - Target ID : 3225 I tried connecting to the... (5 Replies)
Discussion started by: ROCK_PLSQL
5 Replies
ncftpls(1)						      General Commands Manual							ncftpls(1)

NAME
ncftpls - Internet file transfer program for scripts SYNOPSIS
ncftpls [options] ftp://url.style/host/path/name/ OPTIONS
Command line flags: -m Use a machine readable list format, if the server supports it. This requires that the server software support the MLSD extensions, and many implementations do not have these features. -1 Most basic format, one item per line. -l Long list format. -C Columnized list format. This is the default list format. -R Recurse all subdirectories while listing. -a Show all files, if server allows it (as in "/bin/ls -a"). -i XX Filter the listing (if server supports it) with the wildcard XX. -x -XX Set the ls flags to use on the server. -u XX Use username XX instead of anonymous. -p XX Use password XX with the username. -P XX Use port number XX instead of the default FTP service port (21). -d XX Use the file XX for debug logging. -t XX Timeout after XX seconds. -E Use regular (PORT) data connections. -F Use passive (PASV) data connections. The default is to use passive, but to fallback to regular if the passive connection fails or times out. -r XX Redial a maximum of XX times until connected to the remote FTP server. -W XX Send raw FTP command XX after logging in. -X XX Send raw FTP command XX after each file transferred. -Y XX Send raw FTP command XX before logging out. The -W, -X, and -Y options are useful for advanced users who need to tweak behavior on some servers. For example, users accessing mainframes might need to send some special SITE commands to set blocksize and record format information. For these options, you can use them multiple times each if you need to send multiple commands. For the -X option, you can use the cookie %s to expand into the name of the file that was transferred. -o XX Set advanced option XX. This option is used primarily for debugging. It sets the value of an internal variable to an integer value. An example usage would be: -o useFEAT=0,useCLNT=1 which in this case, disables use of the FEAT command and enables the CLNT command. The available variables include: usePASV, useSIZE, useMDTM, useREST, useNLST_a, useNLST_d, useFEAT, useMLSD, useMLST, useCLNT, useHELP_SITE, useSITE_UTIME, STATfileParamWorks, NLSTfileParamWorks, require20, allowProxyForPORT, doNotGetStartCWD. DESCRIPTION
The purpose of ncftpls is to do remote directory listings using the File Transfer Protocol without entering an interactive shell. This lets you write shell scripts or other unattended processes that can do FTP. The default behavior is to print the directory listing in columnized format (i.e. ls -CF), but that is not very useful for scripting. This example uses the -1 flag, to print one file per line: $ ncftpls -1 ftp://ftp.ncftp.com/pub/ncftp/ You can also do a remote "ls -l", by using "ncftpls -l". If you want to try other flags, you have to use them with the -x flag. For exam- ple, if you wanted to do a remote "ls -lrt", you could do this: $ ncftpls -x "-lrt" ftp://ftp.ncftp.com/pub/ncftp/ By default the program tries to open the remote host and login anonymously, but you can specify a username and password information like you can with ncftpget or ncftpput. Note that the standard specifies that URL pathnames are are relative pathnames. For FTP, this means that URLs specify relative pathnames from the start directory, which for user logins, are typically the user's home directory. If you want to use absolute pathnames, you need to include a literal slash, using the "%2F" code for a "/" character. Examples: $ ncftpls -u linus ftp://ftp.kernel.org/%2Fusr/src/ $ ncftpls ftp://steve@ftp.apple.com/%2Fetc/ DIAGNOSTICS
ncftpls returns the following exit values: 0 Success. 1 Could not connect to remote host. 2 Could not connect to remote host - timed out. 3 Transfer failed. 4 Transfer failed - timed out. 5 Directory change failed. 6 Directory change failed - timed out. 7 Malformed URL. 8 Usage error. 9 Error in login configuration file. 10 Library initialization failed. 11 Session initialization failed. AUTHOR
Mike Gleason, NcFTP Software (http://www.ncftp.com). SEE ALSO
ncftpput(1), ncftpget(1), ncftp(1), ftp(1), rcp(1), tftp(1). LibNcFTP (http://www.ncftp.com/libncftp/). ncftpls NcFTP Software ncftpls(1)
All times are GMT -4. The time now is 07:16 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy