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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bind: cannot assign requested address

I've recently switch over to AWS from Rackspace and I'm setting up a simple geolocation server using freegeopip . While the following commands work perfectly on a new Rackspace serve (Ubuntu) I can't getting working on AWS (tried Red Hat and Ubuntu). Here is the code I've used to set it up:

As I've said this works perfecectly on my Rackspace instace but AWS gives me this error:

I've checked this port with netstat and there is nothing running on it. I have no idea why I'm getting this error. Any ideas?

  • amazon-web-services
  • geolocation

Vasili Syrakis's user avatar

2 Answers 2

In many cases, binding to 0.0.0.0 is the best course of action unless you have a specific reason to bind only to a specific address.

But I assume that what you're doing isn't working, because you're trying to bind to the instance's public IP address, which you'll find (via ifconfig ) your IP stack isn't aware of.

AWS instances are only natively aware of their private IP address, which is what you need to bind to.

EC2 (classic and VPC) instance public addresses associates with instances are 1:1 NAT translated to the private address by the AWS network infrastructure.

Michael - sqlbot's user avatar

  • I am also facing same issue.I want to use public ip of openstack vm instead of private ip i.e. eth0 ip. –  Vikram Ranabhatt Mar 27, 2016 at 11:50
  • @Chris_vr this question is about AWS, where binding to the wildcard or private IP specifically is the correct (and only) option. Openstack, I have no idea, but if you only see the private IP bound to the stack, the answer is probably similar, and if so, then trying to bind a socket to the public IP is the wrong way to accomplish what you are trying to do. –  Michael - sqlbot Mar 27, 2016 at 11:59

AWS runs network address translation between your instance and the internet. So, the AWS instance might be reachable by the IP address 08.08.08.0808, however the server is actually configured to use 88.88.88.88. What I need to do was bind to the internal IP of the server which I found with ifconfig.

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cannot assign requested address udp

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SSH Bind Address - Cannot Assign Requested Address

I've got 2 NIC's, and just want to SSH from one specific interface. As you can see, the -b option in ssh doesn't seem to be able to use my address. Not sure why?

It's like SSH is unaware of the VRF. I thought this could be a namespace issue so tried also using the kernel settings below to no avail.

Added below as per request of comment:

I did manage to get this working via the below:

However, I can only get it working with sudo. Otherwise I get:

Not sure why really. But I just need to be able to use client apps like SSH over this interface. How/What is the way to do it?

The only thing I can seem to find online is about binding the application's SO_BINDTODEVICE to a certain interface in order to force a socket to be created on a specific NIC. But I'm really not sure how to go about setting this up with for an SSH client connection.

john smith's user avatar

  • Show the output of ip -4 addr list . If the IP doesnt show bound to these systems in the address lists you cant bind to the IP with services on system. –  Thomas Ward ♦ Dec 3, 2022 at 20:05
  • Updated post to show its there –  john smith Dec 3, 2022 at 20:12

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cannot assign requested address udp

Developer Tools

Engage with us, can't bind to udp.

Avatar

I filed a ticket but just in case anyone knows what's up.

CentOS 7 host, London

All I use it for is an authoritative DNS server - slave - running NSD.

It got migrated automatically few days ago. Today noticed it wasn't responding to UDP requests.

When I ssh into the box -

Rebooting doesn't help, trying to restart the service doesn't help, it can't bind to UDP port 53.

Fortunately my other two nameservers (both also linode - one in Texas and the other I think is either New Jersey or Califormia, I'd have to look) work just fine, but I need this one to work as well. Redundant redundancy is why I have it, and it isn't very redundant if it isn't running.

Avatar

The actual problem, when they migrated this linode, they changed the IPv6 address.

The IPv6 address given by ifconfig is different from what it has historically been, what it is listed as in my admin panel for that linode.

And that's why NSD wouldn't start.

So if linode migrates you and suddenly a service won't start, well, check your IP addresses.

Avatar

We don't just change IPs because you moved hosts. Something else was at play.

Well I don't know what else was at play, but the IPv4 address stayed the same.

The IPv6 address, which is what the reverse DNS is set to, use to be 2a01:7e00::f03c:91ff:fe18:8a7e and now /sbin/ifconfig is showing it to be 2a01:7e00::825f:e564:ad53:72fc

I certainly didn't change it, nor do I believe I have the ability to change it beyond the local subnet pool assigned to the VM. So whatever was at play wasn't my end.

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cannot assign requested address udp

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[Resolved] Can't connect to OpenVPN Server from MacOS Client.

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

Post by fpolig01 » Tue Nov 16, 2021 3:19 pm

Re: Can't connect to OpenVPN Server from MacOS Client.

Post by TinCanTech » Tue Nov 16, 2021 3:22 pm

fpolig01 wrote: ↑ Tue Nov 16, 2021 3:19 pm Note* I replaced the domain name it's trying to connect to with xxx for privacy. [Nov 16, 2021, 07:12:45] Connecting to [xxxxxxx.net]:1398 (192.168.0.228) via UDPv4

Post by fpolig01 » Tue Nov 16, 2021 3:31 pm

Post by TinCanTech » Tue Nov 16, 2021 4:05 pm

Post by fpolig01 » Tue Nov 16, 2021 4:35 pm

Post by TinCanTech » Tue Nov 16, 2021 4:53 pm

fpolig01 wrote: ↑ Tue Nov 16, 2021 4:35 pm This is from the windows log. I replaced the values with x's again for privacy. But it's connecting to the same exact domain name

Post by fpolig01 » Tue Nov 16, 2021 6:21 pm

Post by TinCanTech » Tue Nov 16, 2021 7:05 pm

fpolig01 wrote: ↑ Tue Nov 16, 2021 3:19 pm Connecting to [xxxxxxxxx. ddns.net ]:1398 ( 192.168 .0.228) via UDPv4

Post by fpolig01 » Tue Nov 16, 2021 7:27 pm

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Unable to bind UDP socket: Cannot assign requested address ? #5

@sdysj

sdysj commented May 13, 2014

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Sorry, something went wrong.

sdysj commented May 14, 2014

Sdysj commented may 15, 2014.

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What does "Bind Error: Can't assign requested address (249)" mean?

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Filebeat + Netflow error: "bind: cannot assign requested address"

Dear all, I config filebeat and netflow ( softflowd on pfsense ) but I got issue. Any solution for that? Thanks systemctl status filebeat -l ● filebeat.service - Filebeat sends log files to Logstash or directly to Elasticsearch. Loaded: loaded (/usr/lib/systemd/system/filebeat.service; enabled; vendor preset: disabled) Active: active (running) since Thu 2020-04-09 21:11:22 +07; 14s ago Docs: https://www.elastic.co/products/beats/filebeat Main PID: 10233 (filebeat) CGroup: /system.slice/filebeat.service └─10233 /usr/share/filebeat/bin/filebeat -e -c /etc/filebeat/filebeat.yml -path.home /usr/share/filebeat -path.config /etc/filebeat -path.data /var/lib/filebeat -path.logs /var/log/filebeat

My filebeat.yml: # Wazuh - Filebeat configuration file filebeat.modules: - module: wazuh alerts: enabled: true archives: enabled: false

My netflow.yml: # Module: netflow # Docs: https://www.elastic.co/guide/en/beats/filebeat/7.5/filebeat-module-netflow.html

Please take a look at this post: Udp 127.0.0.1:2055: bind: address already in use in 7.6 netflow module

Hi, but I don't config the filebeat.inputs

I changed from 192.168.1.23 to 0.0.0.0

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.

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IMAGES

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COMMENTS

  1. c++

    This answer is correct. You may bind to a local IP address, although it isn't necessary, and if you want UDP 'connected' semantics you must connect () to the remote IP address.

  2. "Can't assign requested address" when sending to a UdpSocket

    6 The address you used to bind your UdpSocket to is a multicast address. The argument to UdpSocket::bind should be the local address you send from. The docs use 127.0.0.1:34254. If it is not currently being used, this should work for you. Additionally you can give it an array of potential adresses to use. Share Improve this answer Follow

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

    OSError: [Errno 99] Cannot assign requested address Solution: 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. how-i-fixed-python-oserror-errno-99-cannot-assign-requested-address.txt 📋 Copy to clipboard ⇓ Download

  4. OpenVPN

    networking - OpenVPN - Socket bind failed on local address [AF_INET] IP:1194: Cannot assign requested address - Unix & Linux Stack Exchange OpenVPN - Socket bind failed on local address [AF_INET] IP:1194: Cannot assign requested address Ask Question Asked 10 years, 5 months ago Modified 1 year, 5 months ago Viewed 94k times 9 How get it resolved?

  5. bind: cannot assign requested address

    2 Answers Sorted by: 7 In many cases, binding to 0.0.0.0 is the best course of action unless you have a specific reason to bind only to a specific address. But I assume that what you're doing isn't working, because you're trying to bind to the instance's public IP address, which you'll find (via ifconfig) your IP stack isn't aware of.

  6. udp connect failed: Cannot assign requested address #364

    Milestone. No milestone. Development. No branches or pull requests. 4 participants. Just replaced Unbound 1.12.0 with 1.13.0, without changing the Unbound configurion file. With verbosity: 1 the Unbound log is now flooded with thousands of unbound [21:0] error: udp connect failed: Cannot assign requested address for <str...

  7. SSH Bind Address

    bind 172.31.16.22: Cannot assign requested address ssh: connect to host 172.31.16.10 port 22: failure It's like SSH is unaware of the VRF. I thought this could be a namespace issue so tried also using the kernel settings below to no avail. $ sudo sysctl -a | grep l3mdev net.ipv4.raw_l3mdev_accept = 1 net.ipv4.tcp_l3mdev_accept = 1

  8. Can't bind to UDP (10990)

    The IPv6 address, which is what the reverse DNS is set to, use to be 2a01:7e00::f03c:91ff:fe18:8a7e and now /sbin/ifconfig is showing it to be 2a01:7e00::825f:e564:ad53:72fc I certainly didn't change it, nor do I believe I have the ability to change it beyond the local subnet pool assigned to the VM.

  9. Discussion Forum: [SOLVED]problem ip and port

    WARNING: UDP_OpenSocket: port: 27015 bind: Cannot assign requested address FATAL ERROR (shutting down): Couldn't allocate dedicated server IP port 27015. Edited by DieFeM on April 29 2018 21:10 : Rocco #2 . Posted on April 26 2018 10:47. Moderator Posts: 3284 Joined: 31/01/2012 08:10:

  10. write UDP: Can't assign requested address (code=49) #610

    Issues 28 Pull requests 2 Actions Security Insights New issue write UDP: Can't assign requested address (code=49) #610 Closed x-o1d opened this issue on Mar 22, 2020 · 3 comments x-o1d commented on Mar 22, 2020 change the configuration to side step this issue create a post disconnect script to automatically flush routes

  11. How to deal with this problem?RLS failure #507

    Socket bind failed: Cannot assign requested address [2023-02-10 20:18:38.226] [sctp] [error] Binding to 172.31.13.37:0 failed. SCTP bind failed: Cannot assign requested address

  12. Errno 99

    Errno 99 - Cannot assign requested address Ask Question Asked 2 years, 4 months ago Modified 2 years, 4 months ago Viewed 13k times 1 I am trying to connect to IP address to receive data. The IP belongs to an AWS ec2 instance and we opened a UDP port on the server.

  13. TCP/UDP: Socket bind failed on local address [AF_INET]192.168 ...

    TCP/UDP: Socket bind failed on local address [AF_INET]192.168.1.223:2001: Cannot assign requested address Need help configuring your VPN? Just post here and you'll get that help.

  14. [Resolved] Can't connect to OpenVPN Server from MacOS Client

    So there is definitely some sort of disconnect. I was thinking maybe firewall on my Mac? Here is part of the OpenVPN log file on my MacOS. I see this repeated several times. Any help is appreciated as I'm traveling soon and really would like to be able to access my home network!

  15. Unable to bind UDP socket: Cannot assign requested address ? #5

    I have configured as googlecode wiki said but always get error "Cannot assign requested address". kernel: 3.14.3 config: [test] proto = nacltai proto_publickey = xxxxxxxxxxxxxxxxxxx proto_privatekey = xxxxxxxxxxxxx local = tuntap local_i...

  16. What does "Bind Error: Can't assign requested address (249)" mean

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    Can't assign requested address, C++ UDP sockets Ask Question Asked 12 years, 4 months ago Modified 12 years, 4 months ago Viewed 9k times 2 The following code is from http://digitalpbk.blogspot.com/2007/10/unix-networking-sockets-udp-transmitter.html, It runs fine on localhost but when I change it to my ip it gives the error

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