cannot assign requested address (errno=99) openvpn

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It doesnt connects to the local open vpn server on 127.0.0.1 #224

sajiljosephs commented Sep 29, 2021

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brinza888 commented May 21, 2023

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• OPNsense Forum »
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• OpenVPN:TCP/UDP: Socket bind failed on local address [AF_INET]

Author Topic: OpenVPN:TCP/UDP: Socket bind failed on local address [AF_INET]  (Read 13315 times)

Re: OpenVPN:TCP/UDP: Socket bind failed on local address [AF_INET]

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ssh tunnel - bind: Cannot assign requested address

Trying to create a socks (-D) ssh tunnel - Linux box to Linux box (both centos):

sshd running on remote side ok.

From local machine we do / see this:

(where 8.8.8.8 is really my server's IP and 'user' is my real username)

I am logged into the remote side in this terminal-window. I can verify that the local port was unused prior to this command, and then used by an ssh process, after the command, via:

So, unlike most googled-responses with this error, the problem would not seem to be the loopback interface assignment. If I try to use this tunnel with a mail client, the local-side permits the attempt (no 'proxy-failed' error), but no data / reply is returned.

On the remote side, I do have "PermitTunnel yes" in my sshd_config (though 'yes' should be the default, anyway).

Ideas or Clues?

Here is the relevant debug-output

Other clue: If I run a Virtual Box on the client running Windows, open a tunnel with putty in that box, that tunnel, to the same remote server, works.

Stranger Still" If I use Putty (for linux) running directly on the Linux Client, it does NOT work, even if the settings are an exact duplicate of the putty settings which DO WORK in Putty running on Windows in a Virtual Box on the same Client Machine?? There is something fishy ... still trying experiments to figure out what it is.

• What if you try and force it to use ipv4? (just as an initial troubleshooting test). E.g. ssh -4 -D 1080 [email protected] –  Friedrich 'Fred' Clausen Nov 1, 2012 at 10:54
• Can you try a higher port number, 4000? –  Baldrick Nov 1, 2012 at 10:57
• Thanks for inputs. I got it to work with: ssh -4 -D 8081 [email protected] –  JosephK Nov 1, 2012 at 15:51

The close the loop here. The answer, in this case, was to force the ssh client to use ipv4. E.g.

• So I would think, except that I can select 'force ip4' in putty (running on Linux) without success. Also IPV6 is disabled on this machine, so theoretically should not have been at play. The completely inconsistent results I still get trying different permutations of this thing leave me scratching my head. In any case, your answer helped me get it working, and perhaps has uncovered something odd about how this version of CentOS or Linux Kernel or some-such is operating - Thanks. –  JosephK Nov 6, 2012 at 5:57
• 1 Thanks a lot, the -4 was also the solution for Ubuntu 11.04. –  Sander Dec 24, 2012 at 21:03
• 6 Instead of having to specify -4 every time, assuming all ssh connections are to be made with IPv4 only, add "AddressFamily inet" to your ssh_config file -- per user in ${HOME}/.ssh/ssh_config, or system wide for all users in /etc/ssh/ssh_config –  J G Miller Mar 13, 2017 at 13:04
• 6 What was the clue that made you think to try -4 ? –  Paul Price Apr 28, 2018 at 0:11
• 2 Refer to electricmonk.nl/log/2014/09/24/… . The clue is it listens on ipv6: "debug1: Local forwarding listening on ::1 port 8080." –  Haili Sun Oct 29, 2021 at 5:26

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Ghost process on a UDP port - Address already in use (errno=98)

An OpenVPN server instance loops its initiating sequence in a deadlock. The log reads:

Booting fails shortly.

Now, sudo lsof -i:<port> gives no output.

However, sudo netstat -tunlp |grep <port> gives

The VPN was working one minute then suddenly it failed on me.

To no effect, I tried restarting the systemd service and the operating system (up to date Raspbian OS).

So while similar questions exist, the issue is finding what is taking up the port. It looks like a ghost to me.

How can I free up a port when apparently no process is listening on it?

FYI, the whole deadlock loop from the OpenVPN log:

The contents of OpenVPN's server.conf

Looking back at the logs, the issue started at the time of a power outage. When the electricity came back on, the OpenVPN server could not recover.

Solved by using the repair option of the installation script followed by a reboot.

curl -L https://install.pivpn.io | bash

(The repair option reinstalls the OpenVPN server with the existing config.)

UPDATE: Turns out I had WireGuard on the box listening on the same port. WireGuard had no associated process, its a kernel module. (Possibly it had an associated systemd service but I never checked before I purged it.)

Why lsof and netstat didn't point out to WireGuard remains a mystery to me.

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How I fixed Python OSError: [Errno 99] Cannot assign requested address

When binding a socket, you see an error message like

In my case, the issue was that I was trying to bind the specific IP address  192.168.1.100 but the computer running the script did not have said IP address configured on any interface.

so I needed to change the bind IP address to either  0.0.0.0 to listen to ANY IP address or I needed to change  192.168.1.100 to the IP address of the host computer I am running the script on.

Docker container [Errno 99] Cannot assign requested address

Note that for Docker containers, either you need to run them in network_mode: host to use the host’s network systemd, or you need to bind to the container’s IP address. You can not bind to the host’s IP address from the contaienr unless using  network_mode: host ! But you can forward the ports from the host, binding to a specific IP address.

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OpenVPN server not starting

I have a VPN server running on Ubuntu 18.04. The server cannot start although it was working some days ago (ports are open I've checked by setting the ssh to use them). I have disabled autostart as pointed out in this post so I can see exactly the errors that make the server not start. First thing that surprised me was that I had to do both sudo update-rc.d openvpn disable and edit /etc/default/openvpn to uncomment the line AUTOSTART="none" to stop the VPN server from automatically starting. Once it does not starts on system boot, when I start the server using sudo openvpn server.conf with a terminal in /etc/openvpn/ I get the following output:

My server configuration file is:

Any ideas on what can I do to solve this? I have changed the relevant ports and the tips to XXX for safety.

Have you seen this line in your log ?

There is already a process listening to the port, presumably an instance of Openvpn is already running. If you want to check type netstat -antup and see what program is listening on that port.

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TCP/UDP: Socket bind failed on local address [AF_INET][undef]:1194: Address already in use (errno=98)

Moderators: TinCanTech , TinCanTech , TinCanTech , TinCanTech , TinCanTech , TinCanTech

Post by OpenVPNUser125 » Wed Jan 05, 2022 6:02 pm

Re: TCP/UDP: Socket bind failed on local address [AF_INET][undef]:1194: Address already in use (errno=98)

Post by TinCanTech » Wed Jan 05, 2022 6:50 pm

Post by OpenVPNUser125 » Thu Jan 06, 2022 8:49 am

Post by TinCanTech » Thu Jan 06, 2022 2:08 pm

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