Ubuntu Networking :: Sftp Client For Redirected Ssh To Port 2222?

Apr 7, 2011

I have remote server and when I want to connect to it from internet I need to choose port 2222. I tryed to do it using filezilla, gftp, it can be done. Because they want from me to use default ssh port 22

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Fedora Networking :: Port Redirect, I.e. Whatever Comes Through Whatever Interface On Port AAAA Will Get Redirected To Port BBBB?

Feb 18, 2010

I want to do a simple port redirect, i.e. whatever comes trough whatever interface on port AAAA will get redirected to port BBBBI thought that iptables -t nat -I PREROUTING --source 0/0 --destination 0/0 -p tcp --dport AAAA -j REDIRECT --to-ports BBBBhowever it doesn't work, e.g. nc -v -w2 -z localhost AAAA gives:

nc: connect to localhost port AAAA (tcp) failed: Connection refused
nc -v -w2 -z localhost BBBB


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General :: SFTP Server Port Blocked On Uni Network / Need To Change Listening Port

Oct 21, 2010

VERY new to linux, erm but I have an issue that needs solving!I recently moved to university, where their network blocks sftp port 22, this means that I cannot connect to my FTP server which is running a version of linux.Now I've got this ftp server connected to a seedbox and it was created using the following walk through..Code:I have written this guide for a friend, but I though it would be useful for others as well.

There are several guides floating around, but I found that most always cock up in some way. This one is tried and tested to work on Debian Etch (on an OVH rps, but should apply to most servers).If there is a new stable release of rtorrent/libtorrent then I will update this guide to show you how to update it (without reinstalling the whole server).

At the bottom there are also instructions to install ftp access & some network monitoring software.Basically, I would really like someone to be able to construct the commands on how to change the listen port for sftp connection on linux or add another port to the list that Linux would use so that I could put in through putty.

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Ubuntu Networking :: Port Forwarding To VPN Client (kvpnc)

Mar 9, 2010

I set up an ssh server and configured port forwarding on my router so that I can access the ssh server from the internet. This is working fine, also from within the LAN.

Additionally this machine should be connected to an VPN Server on the internet. Again, this is working. I get connected, the tun interface is coming up, etc.

The moment the VPN Connection is established I can not connect to the SSH Server anymore from the internet, LAN ist still working fine. I guess it has something to do with the route that is set by the VPN Connection?!

So my question is, what do I have to do to reach the ssh server from the internet while the ssh server is connected to an VPN Server itself.

ifconfig without VPN

eth0 Link encap:Ethernet HWaddr 00:1c:c0:c4:df:80
inet addr: Bcast: Mask:
inet6 addr: fe80::21c:c0ff:fec4:df80/64 Scope:Link


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Networking :: Enable A Client To Port Forward Through VPS?

Jul 27, 2011

Well I have been searching for more than a month now and I think I have read every single post related to this subject and finally decided to make a thread.

Now before I begin I am running Openvpn on my CentOS VPS. I have set static IP's for everyone.

Now what I am looking for is this lets say one of my clients wants port 60005 forwarded through my VPS to the internet what are the correct commands to run.

server-ip:60005 to loacl-ip:60005
Sever IP 24.xx.xx.xx
Client IP

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Ubuntu Networking :: NX Client - Ssh: Connect To Host Port 22: Connection?

Jul 29, 2010

I have a Windows machine on which NX Client has been installed. I wanted to test if I could access my Ubuntu box. The Ubuntu Box has NX Server, Node and Client installed. When I try to log in from the Windows machine using NX Client with my Ubuntu username and password I get an error connection refused.

The following service is running: OpenBSD Secure Shell server sshd How can I resolve the issue?

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Networking :: Port Forwarding In Bittorrent Client In Internal Network With Nat

Apr 9, 2010

I have an internal network behind a server <> connected to the internet that NATs my ip <> only. NAT is not allowed to any other ip addresses. When I use Transmission Bittorrent client to download torrents, The thing is that this is not my machine and doesn't have access to the internet at all. What is happening here? Can anyone help me?

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Networking :: Unable To Ping Host From OpenVPN Client After Port 22 Denied

Mar 28, 2010

After I applied below iptables rule.. I am unable to ping the host in from OpenVPN client

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Debian Multimedia :: Graphical Client For Sftp?

Jun 29, 2011

I've never really found an FTP client that I really like, but until recently I've been using gftp. Now I'd like to switch from ftp to sftp, and when I try this in gftp (using the host ftps://ftp.website.com) it just says this:FTPS Support unavailable since SSL support was not compiled in. Aborting connection.

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OpenSUSE :: Ssh And Sftp SLES With Iseries Client?

Jan 27, 2011

I have a sles 10 server that I need an iseries 5 client to make an sftp connection to. I'm getting the following error in the /var/logs/message log:


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General :: Creating A Daemon Based Sftp Client?

Mar 18, 2011

If i were to build an sftp client which launched with logon details, and could then controlled by sending commands to that daemon; would that be ideal way to create an sftp client with disposable credentials?

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Security :: Restrict Sftp Access And Changing Its Port?

Mar 17, 2010

I tried changing the sftpserver port but its not working, besides how can i restrict users from particular ips.Eg: users a can ssh from 192.168.*.*user b can sftp from 200.*.*

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Debian :: User Cannot Download Any Files From Host Via WinsCP Or Other SFTP Client

May 26, 2015

Can i block on debian that user can not download any files from host via winscp or other SFTP client ?

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Debian Multimedia :: SFTP Client Setup - User Based Login

Nov 22, 2010

I have setup SFTP and it is running without any problems. The problem I have is finding a client that supports key based logins through Linux. I do not want user based logins available and so far the solution works through my Windows machines using WinSCP. The only client I have found for Linux seems to be FileZilla but I have to convert my private key to the FileZilla format which removes the passphrase leaving it nice and insecure.

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Ubuntu Servers :: Sftp On Vsftpd - Make / Force All Users To Use Sftp And Not Just Ftp

Apr 13, 2011

i have a vsftpd server running well but i want to make/force all users to use sftp and not just ftp is this possible?

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Ubuntu Servers :: Postfix Smtp Client Configuration For Port 465?

Jan 2, 2010

configuring my postfix server to send mail over smtps port 465. My ISP (as is the case with many ISPs), is blocking outbound SMTP, so I need to configure postfix to relay my mail out through my ISPs SMTP servers.

I was able to get it to work with gmail, which uses port 587, by using SASL: [URL] but that configuration is less than ideal as gmail drops the "reply to" address so when people receive my email, it looks like it's from gmail instead of from my server.

If I use my ISP SMTP servers as a relay the "reply to" address is not stripped, but the relay uses ssl over port 465 instead of TLS. According to the SASL readme:


Postfix does not deliver mail via TCP port 465 (the obsolete "wrappermode" protocol). See TLS_README for a solution that uses the "stunnel" command.

I've looked at the TLS_README and can't figure out what I need to do. how to configure this?

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Programming :: Tcp Client Socket : Get Own Port Number?

Oct 1, 2010

I am working with simple tcp client to establish connection to sockaddr_in servAddress and send data segment:

connect(sockfd,&servAddr,sizeof(servAddr)) < 0)
send(sockfd, pkt, pktLen, 0);

Elementary... Here's the tricky part: next i have to handle user level ack the server is sending to "client"... To do that i have to open server socket on the same port number the system assigned to my client socket before. How can i get it ( in user level code)?

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General :: How To Specify Which Port Mount (NFS Client) Tickle Server

Jul 3, 2011

I have nfs-server installed and running on my Ubuntu 10.04 server. I have some directories exported. I can connect from my Ubuntu 10.04 PC using the commands:
sudo mount taylor10:/data0 /t10/data0
sudo mount taylor10:/data1 /t10/data1
sudo mount taylor10:/data2 /t10/data2
sudo mount taylor10:/data3 /t10/data3

However, when I have my firewall on the PC enabled (Firstarter) I cannot make the mounts. I have ports 111 and 2049 open. If I stop the firewall, do the mounts and then start the firewall I am still mounted to the nfs shares. The connection is on port 2049. I have observed that when the firewall is enabled and I issue the mount command I get traffic on a random port such as 46694, 37022, etc. I have found instructions regarding editing /etc/default/nfs-common but they seem to control the port the server is listening on, not the port which the client is asking on. How do I lock down the port which mount and/or the nfs client is using to talk to the server to make the initial contact.

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Ubuntu Networking :: Error - Remote Port Forwarding Failed For Listen Port 5500

Aug 7, 2010

When I use the following command:

ssh user@ssh_server -L 5500:localhost:5500 -p 22

everything works fine. I can log in, and local port forwarding is done. Otherwise when I use the command:

ssh user@ssh_server -R 5500:localhost:5500 -p 22

I get an error "remote port forwarding failed for listen port 5500". However when I try remote port forwarding in WinXP by use of putty there is no problem...

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General :: Setup A Port Forward From Client Computer's Shell?

Mar 24, 2011

I notice that my bittorrent client is capable of automatically setting up port forwards with my router, and I want to know if I can do the same in a shell script. The reason is, that since my router is stupid and won't let me keep static IP addresses (it seems they forced a DHCP refresh every week to make me want to pay for a more expensive model which doesn't), I need to get my computer to change the port forward to follow my computer's changing internal network IP address. I have a couple of port forward manually entered into my router settings for web interfaces to bittorrent etc, but of course these have a good chance of being invalidated at each DHCP refresh cycle.

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Networking :: Connecting Debian Client To Voyager Client Via Crossover Cable?

Jan 6, 2011

trying to create a "local network" by directly connecting an IBM Thinkpad with Debian Linux installed on it to an Alix computer running Voyager Linux. I'm following a "how to" I found to create a music server, hence the requirement. My issue is I can't get a static IP address to be configured on the Debian machine.I've trawled the net and have found the instructions about editing the /etc/network/interfaces and have tried to do this. First I tried to get DHCP working so I could connect the Debian machine to the net and this proved successful. I edited the interfaces file to look as follows:

# The loopback network interface
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp

Then I tried adding a static IP address to the machine. As this is a network purely between two machines I made up the IP addres and used and used a NetMask calculator to give me a NetMask of (I told the calculator there would be 2 machines on the network). I then edited the interfaces file as follows:

# The loopback network interface
auto lo
iface lo inet loopback


I re-booted the machine (ifdown eth0 followed by ifup eth0 keeps saying that eth0 hasn't been configured - a problem there that I don't understand), but during boot up time it failed to assign the Static IP address to eth0 and made me go into SU mode. To fix it I simply replaced the interface file with the static IP inputs with the file that had the DHCP entries (I'd made a copy of the DHCP file), and re-started the machine. Everthing came up fine. So the first question is how do I get a static IP address to be assigned to eth0 such that whenever I shut down and restart the machine the static IP address is always loaded?

The second question is around creating the network via the cross over cable. From what I've found via Google, all I should have to do is create a static IP address on the Debian machine and a static IP address on the Voyager machine. Once they're connected by the cross over cable they should see each other. Is that correct, or do I have to do anything else?

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Ubuntu :: Websites Get Redirected At Random With Both Browsers

Jan 23, 2011

This happens at random and the problem persists even when using an alternative browser (Firefox & Chrome), being redirected to the same website. Sometimes it's [URL] going to [URL] going to AOL Lifestream.

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Ubuntu Networking :: Port Forwarding Through A Specific Port?

Jul 14, 2011

I want to set my ip as static and port forward it through a specific port can anyone help me with this im using ubuntu 10 with 64 bit OS

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General :: Does Not Get Redirected To STD Error

Nov 29, 2010

I am not really a Linux or unix user, so apologies if the question seems too easy to be asked on the forum, but I tried using the search engines and failed.
cat < foo 2> bar
Why doesn't this get redirected to stderror on error conditions?

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Ubuntu Networking :: Can SSH But Can't SFTP

May 31, 2010

Weird problem; I have set up SSH on my 10.04 server. I can putty to it over my LAN from my Win 7 box but when I try to SFTP I get "connection timed out".

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Networking :: Use Iptables In Order To Forward All The Incoming Packets For Port 5555 To Port 5556?

Apr 4, 2011

I'm trying to use iptables in order to forward all the incoming packets for port 5555 to port 5556 on the same server (

I wrote the following commands:

iptables -A PREROUTING -t nat -i any -p tcp --dport 5555 -j DNAT --to
iptables -A FORWARD -p tcp -m state --state NEW -d --dport 5556 -j ACCEPT

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General :: How To Echo Redirected Stdin

Sep 26, 2010

I execute an application from a script file and redirect stdin to it from here-doc like this:

my_cli << HERE_DOC

This works as expected, but I don't see neither the input nor the app output. The application is an interactive prompt written in C. When I interact manually with it, I see the prompt itself and responses to my input, but when I execute the aforementioned script I see nothing. I would like it to print the input and the output as if a real user was typing. Do you know how to achieve that?

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General :: Rpm Doesn't Work When Used With URL That's Redirected?

Jun 4, 2011

If I do the following, if the URL is a redirect, it doesn't work

rpm -ivh http://path/to/rpm

I have to use wget http://path/to/rpm which resolves the redirect and downloads the file, then run rpm on that file.

More for my knowledge of bash than anything else, would there be a way to redirect the file downloaded from wget into the rpm (something like redirection or pipes or something), so that they could be combined into one command and you wouldn't explicitly save the file first.

Something like... rpm -ivh << wget http://path/to/rpm

I have one more question, and that is whether there is a command in linux, such as wget, that would let me pass it a URL and output the redirected-to URL if the argument.

e.g. ('wget --someflag http://orig/url' would output 'http://url-after-redirects-followed')

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Networking :: Iptables Can't Port Forward (PAT Port Address Translation)?

Feb 20, 2010

I'm using a Debian servers, as router/firwall.. I've two ethernet interfaces into the server, one for wan and one for lan. The i use SNAT so my LAN clients can access the internet throgh the debian router. That is working... Now i want to be able to access servers on the LAN site from the WAN site, and i wanna use port address translation (PAT). I have a FTP server running on a lan server, so i'm trying to portward port 21.

iptables -t nat -A PREROUTING -p tcp -i eth1 -d (WANIP) --dport 21 -j DNAT --to

When people try to access my FTP from the WAN site, they are redirected to the local FTP server, and they are promted for crendentials, but when the credentials are typed, and the local ftp server should answer the wan request, the connections dies.

The wan clients are being promted for credentials, so they are redirected to the local lan server, but after that the connections dies, so i think there is some kind of nat problem, when the local lan server is trying to respond to the wan request..

Here i my iptables script:

#flush table
iptables -F
#input regler


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Networking :: MULTICAST Address And Port - Socket Listen Only On Port?

Feb 12, 2009

I make an application on GNU/Linux which listening on a MULTICAST stream, so I open my unconnected socket, bind it on a MULTICAST address and a port, join the multicast group with the "setsockopt (IP_ADD_MEMBERSHIP)", then I receive datagram on my socket.

Now I've two different instances of the same application that run with their own MULTICAST address and port. And what I found strange is that, after a misconfiguration, I switch the ports, for example:

Emitting on and
Receiving on and

And my receiving part doesn't care about the MULTICAST address, it looks like the socket is listening on the port number only! I mean that the receiver [] take its datagrams from emitter [] and vice-versa!

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