socket send fail with error code 99,cannot assign requested address
I am trying to send Router advertisement packet to multicast address ff02::1 using raw socket.The raw socket is binded successfully with rndis0 network interface
When i send RA message header using send() call,sending message is failed with error code 99 ,can not assign requested address. I assigned msghdr.msg_name = ff02::11 address in in6_Addr format
What could be the possible reason for this send fail 99? Thanks
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nginx error: (99: Cannot assign requested address)
I am running Ubuntu Hardy 8.04 and nginx 0.7.65, and when I try starting my nginx server:
I get the following error:
where «IP» is a placeholder for my IP address. Does anybody know why that error might be happening? This is running on EC2.
My nginx.conf file looks like this:
and my /usr/local/nginx/sites-enabled/example.com looks like:
8 Answers 8
With Amazon EC2 and elastic IPs, the server doesn’t actually know its IP as with most any other server.
So you need to tell your linux to allow processes to bind to the non-local address. Just add the following line into /etc/sysctl.conf file:
and then reload your sysctl.conf by:
$ sysctl -p /etc/sysctl.conf
which will be fine on reboots.
To avoid hard-coding the IP address in the config, do this:
As kirpit mentioned above you’ll want to allow linux processes to bind to a local IP address:
Then you want to add the private ip address that is associated with your elastic ip and add that to your sites config:
There might be remaining process/program that’s using/listening at port 80.
You can check that using netstat -lp. Kill that process and start nginx.
With Amazon EC2 and elastic IPs, the server doesn’t actually know its IP as with most any other server. So in the apache virtual host files at least you put *:80 rather than your elastic ip :80
Then it works properly. So theoretically, doing *:80 for nginx should work the same but when you do you get [emerg]: bind() to 0.0.0.0:80 failed (98: Address already in use). Haven’t found a solution yet. .
For people who might be dealing with this in the future, I just looked up my private IP in the AWS instance and bound to that. I verified that nginx was able to listen publicly and perform my rewrite after that. I could not do *:PORT as I had an internal server I was proxying to.
If you are using Network Manager, you have to wait to raise the network interface before starting the service:
systemctl enable NetworkManager-wait-online.service
For Amazon EC2 and elastic IPs, sysctl.conf will not work as nginx still not listen on eth0 .
So, you need to listen *;
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socket.error:[errno 99] cannot assign requested address and namespace in python
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() . I am actually editing the mininet source code.I edited net.py and inside that I used execfile(‘server.py’) execfile(‘client1.py’) and execfile(‘client2.py’).So as soon as «sudo mn —topo single,3» is called along with the creation of 3 hosts my server and client codes will get executed.I have given my server and client codes below.
3 Answers 3
Stripping things down to basics this is what you would want to test with:
This works assuming a few things:
- Your local IP address (on the server) is 10.0.0.1 (This video shows you how)
- No other software is listening on port 6677
Also note the basic concept of IP addresses:
Try the following, open the start menu, in the «search» field type cmd and press enter. Once the black console opens up type ping www.google.com and this should give you and IP address for google. This address is googles local IP and they bind to that and obviously you can not bind to an IP address owned by google.
With that in mind, you own your own set of IP addresses. First you have the local IP of the server, but then you have the local IP of your house. In the below picture 192.168.1.50 is the local IP of the server which you can bind to. You still own 83.55.102.40 but the problem is that it’s owned by the Router and not your server. So even if you visit http://whatsmyip.com and that tells you that your IP is 83.55.102.40 that is not the case because it can only see where you’re coming from.. and you’re accessing your internet from a router.
In order for your friends to access your server (which is bound to 192.168.1.50 ) you need to forward port 6677 to 192.168.1.50 and this is done in your router. Assuming you are behind one.
If you’re in school there’s other dilemmas and routers in the way most likely.
Starting nginx: [emerg]: bind() to IP failed (99: Cannot assign requested address)
Такая ошибка возникает при попытке назначить для прослушивания IP, который в данный момент недоступен (например, при наличии виртуального IP, назначаемого с помощью keepalived или vrrpd).
Для того, чтобы nginx не ругался на несуществующий IP, нужно разрешить бинд нелокальных адресов. Для этого в файле /etc/sysctl.conf прописываем:
После чего перезагружаем конфиг sysctl:
5 комментариев к записи “ Starting nginx: [emerg]: bind() to IP failed (99: Cannot assign requested address) ”
Спустя три года от этого коммента я говорю тебе спасибо:) в полвторого ночи, после внезапной остановки nginx!
Да не за что 🙂
Виртуальный айпишник перешел на другой сервер?)
сертификаты Lets Enscrypt отвалились 🙂 и за ними nginx
Спасибо большое, уфф, я уже весь инет перерыл
Первая ссылка в Google выдаёт тот же совет но с ipv6. Добавил в конфиг обе строки. Но у меня, естественно, ipv4. Так что первая статья не помогла.
Забавно так. Перезагружаешь сервак. Все такие: упали, отжались, поднялись. А nginx такой: «не-не-не, ты чет там нахимичил, возвращай, как было.» А я такой в ТП: «Вы чет там нахимичили, возвращайте как было.» А ТП такая: «без проблем, плати 15 евро.» А я такой, не-не-не. «Ок Google! Там что-то нахимичили, как быть?». И тут вы со своим советом)
socket.error:[errno 99] cannot assign requested address : flask and python
I am having the same problem like here and here
I am Trying to run a flask app inside docker container.It works fine with ‘0.0.0.0’ but it throws error with my ip address
I am behind a corporate proxy. When i checked my ip address with ipconfig, it showed IP Address as : 10.***.**.** And I am using docker toolbox where my container ip is 172.17.0.2 and VM IP Address is 192.168.99.100.
I have a flask app running inside this docker with host
works fine. But when i change it to my ip address
socket.error:[errno 99] cannot assign requested address
I checked again the ip address with a simple flask application which is running on local (i.e without docker)
So the problem is coming only when running inside the docker. And that’s because i am behind a router running NAT with internal ip address. And how do i find this internal ip address with NAT? I have already done port forwarding for flask application with port 5000.
Running `jupyter notebook` gives me: OSError: [Errno 99] Cannot assign requested address #2427
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peterwilli commented Sep 21, 2017 •
I just started using Codenvy. I wanted to run jupyter notebook (http://jupyter.org) but it gave me the following error:
It could be that I am just not getting the concept right, I’m completely new to this program. If that’s the case, please point me in the right direction 👍
Reproduction Steps:
- Create a new workspace
- Select ubuntu(latest) as OS
- When inside the IDE, do:
Codenvy version: 5.17.0
OS and version: Not sure (it’s on codenvy.io, no self-hosted)
Docker version: Also not sure
Codenvy cli.log output: N/a
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ghost commented Sep 21, 2017 •
jupyter notebook —ip=0.0.0.0 —port=8080
In dashboard, go to your workspace settings, runtime — dev machine — servers. Find URL that corresponds to 8080 
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peterwilli commented Sep 21, 2017
@eivantsov Thanks! It works! I was wondering why it works like this? (explicitly entering 0.0.0.0).
Also, bit off-topic, do you know how I can paste inside the command line of Codenvy? Thanks!
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ghost commented Sep 21, 2017
Ctrl+Shift+V or Shift+Insert
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peterwilli commented Sep 21, 2017
For some reason Ctrl+Shift+V doesn’t work on my ChromeBook. Shift+Insert I haven’t been able to do on the chrome keyboard.
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chibby0ne commented Jun 14, 2018 •
I’m writing this here since it is one of the top Google results for this error message.
I was also having the same issue, where I needed to use the —ip=0.0.0.0 or —ip=127.0.0.1 option to launch jupyter. But then I checked the /etc/hosts file and noticed I had a typo in one of the addresses.
I had:
where ACTUALHOSTNAME is my machine actual hostname.
After I changed the first line from 172.0.0.1 to 127.0.0.1 , I was able to successfully launch it without specifying the —ip option.
Perhaps what’s happening is these cases, is that those two first lines associating the loopback IP with localhost hostname are not specified in the /etc/hosts file.
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nanselmo commented Aug 3, 2018
In case it’s helpful, the version of Codeenvy I’m using has a Commands Palette.
First I used eivantsov’s command to explicitly assign the ip and port under the Command Line section:
jupyter notebook —ip=0.0.0.0 —port=8080