OSError: [Errno 99] Cannot assign requested address

I installed the latest prodigy (prodigy-0.5.0-cp35.cp36-cp35m.cp36m-linux_x86_64.whl)

I then ran the following commands from https://prodi.gy/docs/workflow-text-classification:

I get the following error:

I was able to work around this by changing the default host in prodigy.json to 127.0.0.1:

Some additional debugging of waitress directly:

Some information about my environment:

:+1:

The default host is localhost – and considering it’s in your /etc/hosts and you can ping it without problems, I’m really not sure what’s going wrong here… We’re also not doing anything “clever” or especially custom here – Prodigy is mostly just serving the app using waitress with a pretty standard configuration.

On the other hand, network stuff isn’t our strongest skill, so we’re open for suggestions here. Maybe we should consider using 127.0.0.1 instead of localhost then? Adding a note to the docs early on would probably make sense, too. (Even if we get the localhost stuff to work properly, some users may still have their hosts configured differently, so having a little reminder could be nice.)

So I was poking at this further and I noticed I’m only able to get this working when I use host “0.0.0.0”. With “127.0.0.1” the app starts without crashing but I can’t connect to it from a browser.

:slight_smile:

Here’s my Dockerfile:

And the commands I’m running to build and run the container:

The Dockerfile requires that you have the linux prodigy wheel and a prodigy.json in the CWD

Here’s my updated prodigy.json:

Update: I talked with my local docker guru and we’re convinced this is a quirk of docker networking. Obviously when running these tools in production you’ll either need to bind to 0.0.0.0 or setup some kind of gateway like nginx so it probably can’t hurt to mention something about this caveat in the docs.

Thanks for the awesome tool!

Thanks for following up! Definitely good to have this in the docs.

In hindsight I suppose it makes some sense that within the container, localhost doesn’t point out to the outside world.

Thanks, this is really helpful and good to know! I’ve added a “Using Prodigy with Docker” section to the configuration docs that mentions this, link to this thread for more details and also suggests setting "host": "0.0.0.0" as a possible solution for other environments and setups that produce a similar error.

Would it be possible to add an example Dockerfile to the Prodigy documentation. It wasn’t trivial to set up Prodigy in Docker for someone new to Docker, and I spent a couple hours trying to get it to work.

Before I found this post I got Prodigy working in Docker using the “python:3.7-slim” base image, in contrast to the “python:stretch” base image used in the Dockerfile in the previous post. The “python:3.7-slim” base image doesn’t include gcc therefore I had to install gcc in order to install the prodigy*.whl, and then uninstall gcc to save space (see link ). In fact I also had to add g++ because I got another error (see link ). In the end this looks a bit messy but it leads to a Docker image which is less than half the size (733 MB as opposed to 1.51 GB). So in case anyone cares about the size of their Docker image then I thought I’d post my solution here. Here’s the Dockerfile I used.

I hope this helps,

Ressurrecting this thread to attach this https://pythonspeed.com/articles/docker-connection-refused/ which helped me understand when having faced this same problem.

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Could not connect to Redis at 127.0.0.1:6379: Cannot assign requested address

I tried connect to redis server but I can't.

But redis is running, redis log:

It is very strange situation. I read all issues in stack overflow, but is not work for me.

Konstantin Liuterovich's user avatar

  • Do you have any security subsystems like SELinux or AppArmor active? /edit: Also, please provide the output of ss -s . –  Daniel B Jun 14, 2019 at 12:38

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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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redis.exceptions.ConnectionError: Error 99 connecting to 127.0.0.1:6379. Cannot assign requested address #219

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new-player commented Jun 25, 2016

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I have install POSBox v15 on a Raspberry Pi and I'm trying to connect to it via ethernet . 

While DHCP should assign an IP address on 192.168.0.X, 192.168.1.X or 10.0.0.X address range, my LAN is on 192.168.50.X range. So as the setup guide says (https://www.odoo.com/documentation/user/10.0//point_of_sale/overview/setup.html#troubleshoot), I should manually setup the ip address of my POSBox. But what the guide doesn't say is how to manually setup an IP Address for the POSBox ...

So far I haven't been able to successfully change the ip address for the eth0 interface...

I tried to assign an ip address with ifconfig , change  /etc/dhcpcd.conf and  /etc/network/interfaces   but all of these config changes are reset after a reboot of the POSBox. I would like my config to be persistent.

I also tried to put a static IP Address by entering the POSBox eth0 interface's MAC address in the router config but it didn't assign any IP address on the eth0.

Avatar

since the posbox reads the config to the ram you need to edit the proper folder.

Enclosed are the steps for configuring  a static IP:

$> sudo  mount -o remount,rw /root_bypass_ramdisks File /root_bypass_ramdisks/etc/ dhcpcd.conf :add your config to the end of the file interface eth0 static ip_address=10.0.1.60/24 static routers=10.0.1.1 static domain_name_servers=8.8.8.8 8.8.4.4

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From experience, you don't have to setup as noted with the IP addresses in the range 192.168.0.X, 192.168.1.X, 10.0.0.X. My network address is 192.168.3.0/24. My POSBox has not issue accessing from the POS.  When POSBox completed startup, it should print a "welcome message" to the printer specifying the IP address.

Base on the original post, am I correct to say you have try to setup /etc/dhcpcd.conf on the POSBOX? If so, I don't think you need to do this. You don't need to touch network configuration of the POSBOX at all. It is meant to be used as a blackbox.

Assuming you've setup your existing DHCP Server on your network correctly, POSBOX should just get dynamic IP from the DHCP server. If you must, you can set your DHCP server to assign static IP address for the POSBOX using the MAC address of the POSBOX. Though, I don't see any reason for this at all.

So I would suggest you to look at your DHCP server first.

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Socket Error: Cannot Assign Requested Address and Namespace in Python 3

When working with network programming in Python, you may encounter a common error known as “Socket Error: Cannot Assign Requested Address.” This error occurs when you attempt to bind a socket to a specific IP address and port, but the address is not available or does not exist on your machine. In addition to this error, you may also come across the related concept of “Namespace” in Python 3, which plays a crucial role in resolving this issue.

Understanding Socket Error: Cannot Assign Requested Address

In network programming, a socket is an endpoint for sending or receiving data across a computer network. When creating a socket, you need to specify an IP address and port number to bind the socket to. This is done using the bind() method. However, if the specified IP address is not available or does not exist on your machine, you will encounter the “Socket Error: Cannot Assign Requested Address.”

This error commonly occurs when you attempt to bind to an IP address that is not assigned to any network interface on your machine. For example, if you try to bind to the IP address “192.168.0.100,” but your machine does not have any network interface with that IP address, the error will be raised.

Resolving the Error with Namespace in Python 3

In Python 3, the concept of “Namespace” comes into play when dealing with the “Socket Error: Cannot Assign Requested Address.” A namespace is a system that ensures that names in a program are unique and can be used without any conflicts. It provides a way to organize and differentiate between different variables, functions, classes, and other objects.

When encountering the “Socket Error: Cannot Assign Requested Address,” you can resolve it by using the socket.setsockopt() method to set the SO_REUSEADDR option. This option allows you to reuse a local address that is already in use, mitigating the error. By setting this option, you can bind your socket to the desired IP address and port, even if it is already in use by another socket.

In the above example, the setsockopt() method is used to set the SO_REUSEADDR option to 1. This enables the reuse of the specified IP address and port combination, even if it is already in use. By doing so, the “Socket Error: Cannot Assign Requested Address” can be avoided, and the socket can be successfully bound.

Understanding the “Socket Error: Cannot Assign Requested Address” and the concept of Namespace in Python 3 is crucial when working with network programming. By utilizing the setsockopt() method and the SO_REUSEADDR option, you can overcome this error and bind your socket to the desired IP address and port. This allows for smooth communication over the network and ensures the successful execution of your Python programs.

Reference Links:

  • Python Socket Documentation
  • Real Python – Python Sockets
  • Stack Overflow – Difference between SO_REUSEADDR and SO_REUSEPORT

Conclusion:

In Python programming, when encountering a “Socket Error: Cannot Assign Requested Address” error, it means that the requested address and port combination cannot be assigned to the socket. This can occur if the address is already in use by another socket or if the address is not valid. It is important to ensure that the address and port are correctly specified and available for use. Additionally, understanding the concepts of sockets and network programming in Python can help in troubleshooting and resolving such errors.

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Dey Code

How to curl using IPv6 address? – Curl

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The Problem:

I have a VPS with a /64 IPv6 address assigned to it. When I try to curl using one of the IPs in the block, I get the error:

curl: (45) bind failed with errno 99: Cannot assign requested address

What exactly do I need to do to fix this? Shouldn’t I be able to use any IP on the machine when logged in as root?

Basically I just need the ability to curl using any IPv6 assigned to the VPS.

The Solutions:

Solution 1: using ipv6 address with curl.

To curl using an IPv6 address, use the following command format:

Replace "[IPv6 Address]" with the actual IPv6 address assigned to the interface. Ensure that the specified interface has IPv6 enabled. In the provided example, "eth0" is the interface with IPv6 enabled. Replace it with the appropriate interface name if necessary.

To test IPv6 connectivity, use the following command:

Solution 2: Specify the Interface

To resolve the error "bind failed with errno 99: Cannot assign requested address," you can specify the network interface to use with the --interface flag. Here’s an example:

In this example, eth0 is the network interface that will be used for the curl operation.

Solution 3: IPv6 Binding Issue

To address the IPv6 binding issue encountered while attempting to use curl with an IPv6 address, consider utilizing the following command:

By providing the -g flag, the command forces IPv6 binding, ensuring that the curl operation utilizes the specified IPv6 address for the outgoing request. Additionally, including the Host header is essential to specify the intended destination domain. This modification allows for successful curling using the desired IPv6 address.

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  1. Mail delivery failed via SMTP server 'localhost'. error: 99 ...

    1 Reply 17784 Views Tina Santhosh Hello to all the experts, Recently I tried to add a user to my database but I am getting this error when I send the invitation by email. Mail delivery failed via SMTP server 'localhost'.error: 99Cannot assign requested address I am using odoo 10.0 community version. Can someone help me figure this issue out.

  2. getting error 99 Cannot assign requested address in outgoing email

    Run Odoo docker 17.0 in debian 12 server with default nginx configuration. Create a new outgoing email server; Set up a gmail account using username/password and/or OAuth Gmail (is happening in both) Click Test connection; Note: The exact same configuration is working in older odoo dockers. Already tested with odoo 12. Current behavior:

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    docker logs sentry_onpremise_worker_1 - [Errno 99] Cannot assign requested address errors appear; What you expected to happen. I should be able to send mail with the default configuration included with the ./install.sh script

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    From inspecting logs, I have found that the slave is only able to send one status update to the server, and then is never able to send another update, always failing on the call to connect () "Cannot assign requested address (99).

  5. Emails are not sending; (99) Cannot assign requested address

    When checking the Exim Mainlog, Where are the Exim logs?, I see "Cannot assign requested address". How can I resolve this? Workaround The issue comes from the IP not being bound to the server. Make sure that the IP is listed in /etc/mailips and if it is not, add the IP to the mailips file. The format of /etc/mailips is:

  6. OSError: [Errno 99] Cannot assign requested address

    Thanks a lot for the report and the super detailed environment and debugging info! This is really helpful . The default host is localhost - and considering it's in your /etc/hosts and you can ping it without problems, I'm really not sure what's going wrong here… We're also not doing anything "clever" or especially custom here - Prodigy is mostly just serving the app using ...

  7. Could not connect to Redis at 127.0.0.1:6379: Cannot assign requested

    telnet: Unable to connect to remote host: Cannot assign requested address But redis is running, redis log: 8088:signal-handler (1560512157) Received SIGTERM scheduling shutdown... 8088:signal-handler (1560512157) Received SIGTERM scheduling shutdown... 8088:M 14 Jun 14:35:57.370 # User requested shutdown...

  8. Mail delivery failed via SMTP server 'localhost'. error: 99 ...

    1 Balas 17689 Tampilan Tina Santhosh Hello to all the experts, Recently I tried to add a user to my database but I am getting this error when I send the invitation by email. Mail delivery failed via SMTP server 'localhost'. error: 99 Cannot assign requested address I am using odoo 10.0 community version. Can someone help me figure this issue out.

  9. 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

  10. socket.error:[errno 99] cannot assign requested address and namespace

    My server software says errno99: cannot assign requested address while using an ip address other than 127.0.0.1 for binding. But if the IP address is 127.0.0.1 it works. Is it related to namespaces? I am executing my server and client codes in another python program by calling execfile () .

  11. Docker Containers and localhost: Cannot Assign Requested Address

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  12. redis.exceptions.ConnectionError: Error 99 connecting to 127.0 ...

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  13. Cannot setup IP Address for Ethernet on my PoSBox

    I have install POSBox v15 on a Raspberry Pi and I'm trying to connect to it via ethernet.. While DHCP should assign an IP address on 192.168..X, 192.168.1.X or 10.0.0.X address range, my LAN is on 192.168.50.X range.

  14. pymysql.err.OperationalError: (2003, "Can't connect to ...

    divyashie Asks: pymysql.err.OperationalError: (2003, "Can't connect to MySQL server on 'localhost' ([Errno 99] Cannot assign requested address)") I have a streamlit app that requires connection to MariaDB. When I run docker-compose up I get this error: pymysql.err.OperationalError: (2003...

  15. Repl.it SMTPLIB OSError: [Errno 99] Cannot assign requested address

    For reasons unknown to me, a small configuration of commands fixed it. New part of the script for sending the email looks like this: server = smtplib.SMTP('smtp.seznam.cz', 587) server.starttls() server.ehlo() server.login('[email protected]', "my_email_password") server.sendmail(sender, reciever, msg) server.quit()

  16. Socket Error: Cannot Assign Requested Address and Namespace in Python 3

    By doing so, the "Socket Error: Cannot Assign Requested Address" can be avoided, and the socket can be successfully bound. Understanding the "Socket Error: Cannot Assign Requested Address" and the concept of Namespace in Python 3 is crucial when working with network programming.

  17. Dynamic Host Configuration Protocol

    The Dynamic Host Configuration Protocol (DHCP) is a network management protocol used on Internet Protocol (IP) networks for automatically assigning IP addresses and other communication parameters to devices connected to the network using a client-server architecture.. The technology eliminates the need for individually configuring network devices manually, and consists of two network ...

  18. Odoo container : Database connection failure: could not connect to

    could not connect to server: Cannot assign requested address Is the server running on host "localhost" (::1) and accepting TCP/IP connections on port 5432? I tried to open up the port 5432 with ufw but got the same erros. I also tried to change 127.0.0.1 to 0.0.0.0 but nothing. Could you help me?

  19. How to curl using IPv6 address?

    Solution 1: Using IPv6 Address with CURL. To curl using an IPv6 address, use the following command format: curl -g -6 'http:[IPv6 Address]:[Port Number]/' Replace "[IPv6 Address]" with the actual IPv6 address assigned to the interface. Ensure that the specified interface has IPv6 enabled.

  20. fastapi, celery, redis, docker compose: Cannot assign requested address

    fastapi, celery, redis, docker compose: Cannot assign requested address - Stack Overflow fastapi, celery, redis, docker compose: Cannot assign requested address Asked 27 days ago Modified 27 days ago Viewed 87 times 0 I use fastapi, celery, redis and docker-compose to host a RestAPI.