unable to connect to epmd (port 4369) - address (cannot connect to host/port) on Windows 10

Matt Hogan-Jones

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Oct 23, 2019, 6:59:42 AM10/23/19

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Hi,

I've installed RabbitMQ 3.8.0 and Erlang 22.1 (64-bit for both) on 64-bit Windows 10. Both were installed as admin.

I'm able to run rabbitmq-service.bat start successfully and the service appears to be running.

When I try and call rabbitmqctl.bat with anything (e.g. rabbitmqctl.bat status) I get the following:

attempted to contact: [rabbit@mymachine]


rabbit@mymachine:
  * unable to connect to epmd (port 4369) on mymachine: address (cannot connect to host/port)




Current node details:
 * node name: 'rabbitmqcli-14768-rabbit@mymachine'
 * effective user's home directory: C:\Users\myname
 * Erlang cookie hash: hXRZg8Foj+FXs7DwcLF6cg==

I've checked the .erlang.cookie in both the C:\Windows\System32\config\systemprofile location and my user location and they are the same.

Port 4369 is open and listening and I can telnet to it.

We've had no issue installing RabbitMQ to other machines, so I'm hoping this is just some environment issue specific to my machine.

This is really my first time using RMQ so I'm a bit stuck about next steps to take to investigate further.

Wesley Peng

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Oct 23, 2019, 7:25:45 AM10/23/19

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This seems the name resolution problem. All the node names should be resolvable by dns or via hosts file.

Regards

Matt Hogan-Jones <onetru...@gmail.com>于2019年10月23日周三下午6:59写道：

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Matt Hogan-Jones

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Oct 23, 2019, 8:06:57 AM10/23/19

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Hi Wesley,

This is on my local machine, so I'm not sure what the node name should be.

localhost is resolved to `::1` when doing `ping localhost` - how should I deal with name resolution on my local machine?

Thanks,
Matt

On Wednesday, October 23, 2019 at 12:25:45 PM UTC+1, Wesley Peng wrote:

This seems the name resolution problem. All the node names should be resolvable by dns or via hosts file.

Regards

Matt Hogan-Jones <onetru...@gmail.com>于2019年10月23日周三下午6:59写道：

Hi,

I've installed RabbitMQ 3.8.0 and Erlang 22.1 (64-bit for both) on 64-bit Windows 10. Both were installed as admin.

I'm able to run rabbitmq-service.bat start successfully and the service appears to be running.

When I try and call rabbitmqctl.bat with anything (e.g. rabbitmqctl.bat status) I get the following:

attempted to contact: [rabbit@mymachine] rabbit@mymachine: * unable to connect to epmd (port 4369) on mymachine: address (cannot connect to host/port) Current node details: * node name: 'rabbitmqcli-14768-rabbit@mymachine' * effective user's home directory: C:\Users\myname * Erlang cookie hash: hXRZg8Foj+FXs7DwcLF6cg==

I've checked the .erlang.cookie in both the C:\Windows\System32\config\systemprofile location and my user location and they are the same.

Port 4369 is open and listening and I can telnet to it.

We've had no issue installing RabbitMQ to other machines, so I'm hoping this is just some environment issue specific to my machine.

This is really my first time using RMQ so I'm a bit stuck about next steps to take to investigate further.

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Matt Hogan-Jones

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Oct 23, 2019, 8:09:57 AM10/23/19

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If I run this:

.\rabbitmqctl.bat status -n rabbit@localhost

I get the following:

attempted to contact: [rabbit@localhost]

rabbit@localhost:
  * connected to epmd (port 4369) on localhost
  * epmd reports: node 'rabbit' not running at all
                  other nodes on localhost: ['RabbitMQ',
                                             'rabbitmqcli-17848-rabbit']
  * suggestion: start the node


Current node details:
 * node name: 'rabbitmqcli-17848-rabbit@myhostname'
 * effective user's home directory: C:\Users\myusername


 * Erlang cookie hash: hXRZg8Foj+FXs7DwcLF6cg==

Does that mean anything significant?

On Wednesday, October 23, 2019 at 12:25:45 PM UTC+1, Wesley Peng wrote:

This seems the name resolution problem. All the node names should be resolvable by dns or via hosts file.

Regards

Matt Hogan-Jones <onetru...@gmail.com>于2019年10月23日周三下午6:59写道：

Hi,

I've installed RabbitMQ 3.8.0 and Erlang 22.1 (64-bit for both) on 64-bit Windows 10. Both were installed as admin.

I'm able to run rabbitmq-service.bat start successfully and the service appears to be running.

When I try and call rabbitmqctl.bat with anything (e.g. rabbitmqctl.bat status) I get the following:

attempted to contact: [rabbit@mymachine] rabbit@mymachine: * unable to connect to epmd (port 4369) on mymachine: address (cannot connect to host/port) Current node details: * node name: 'rabbitmqcli-14768-rabbit@mymachine' * effective user's home directory: C:\Users\myname * Erlang cookie hash: hXRZg8Foj+FXs7DwcLF6cg==

I've checked the .erlang.cookie in both the C:\Windows\System32\config\systemprofile location and my user location and they are the same.

Port 4369 is open and listening and I can telnet to it.

We've had no issue installing RabbitMQ to other machines, so I'm hoping this is just some environment issue specific to my machine.

This is really my first time using RMQ so I'm a bit stuck about next steps to take to investigate further.

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Wesley Peng

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Oct 23, 2019, 8:11:58 AM10/23/19

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rabbitmqctl status will show that node name.

Regards

Matt Hogan-Jones <onetru...@gmail.com>于2019年10月23日周三下午8:07写道：

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Matt Hogan-Jones

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Oct 23, 2019, 8:18:32 AM10/23/19

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How do you mean? I have put the error message from rabbitmqctl status in the first message. It's not working, hence this question.

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Wesley Peng

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Oct 23, 2019, 8:38:06 AM10/23/19

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Hi

For example your node name is rabbit, you should put this short hostname into system hosts file to resolve it to local address.

Regards

Matt Hogan-Jones <onetru...@gmail.com>于2019年10月23日周三下午8:18写道：

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Matt Hogan-Jones

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Oct 23, 2019, 9:03:23 AM10/23/19

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So effectively add this to the hosts file?

127.0.0.1 rabbit

Do I need to restart the rabbitmq service after doing this?

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Luke Bakken

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Oct 23, 2019, 10:32:21 AM10/23/19

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Hi Matt,

Yes, this means that localhost can resolve in DNS or via C:\Windows\System32\drivers\etc\hosts. It also shows that epmd.exe is running as expected.

Your other errors using mymachine mean that mymachine doesn't resolve in DNS.

What is the output of these commands?

hostname

ping mymachine

nslookup mymachine

The fact that this worked last week suggests that something changed on your machine, like a Windows patch perhaps? I don't use my Win 10 environment every day so I haven't noticed this.

Cross-posted from here: https://stackoverflow.com/q/58507197/1466825

Thanks,

Luke

Matt Hogan-Jones

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Oct 23, 2019, 11:48:21 AM10/23/19

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Hi Luke,

the result of hostname is my machine name (sorry for not actually including it, company policy I'm afraid).

Pinging my hostname from my machine returns "General failure".

nslookup returns two server addresses.

Now, discussing with a colleague reveals that he does not get a general failure from pinging his own hostname, so we're now investigating whether there's an application on my machine that is causing this.

Luke Bakken

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Oct 23, 2019, 12:23:40 PM10/23/19

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Hi Matt,

That's promising!

In an elevated shell on both machines run ipconfig /all and compare differences, especially in the "DNS Servers" area.

ipconfig /release & ipconfig /renew might fix it.

Luke

Matt Hogan-Jones

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Oct 24, 2019, 4:51:11 AM10/24/19

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Hi Luke,

My colleague has installed RMQ and Erlang on their machine and it worked first time for them. We thought it may have been a Windows Defender issue, but I've got the same set up in WD as my colleague and I still get the same issue.

I will follow your suggestions and see what we can find.

Thanks,
Matt

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