Sep 29, 2016 - Connection refused on address that Docker uses to talk to the host. Inside the container to find out the IP that Docker for Mac uses to talk to. Ok, this is driving me kinda nuts. I'm trying to run an Nginx server through Docker, but can't get port 80 exposed properly. ![]() I am stuggeling with port 9000: Connection refused error. I work on Ubuntu 14.04 and faced the problem when trying to run Hadoop in a non-distributed mode, as a single Java process (compare ). I tried to follow Hadoop Wiki suggestions on this error () but I did not succed (I am a beginner Ubuntu user and find it difficult even to 100% understand the suggestions given). I posted from which I conclude that I have some general problem with port 9000 Connection. Telnet output: martakarass@marta-komputer:~$ telnet localhost 9000 Trying 127.0.0.1. Telnet: Unable to connect to remote host: Connection refused nmap output: martakarass@marta-komputer:~$ nmap localhost Starting Nmap 6.40 ( ) at 2015-04-27 11:09 CEST Nmap scan report for localhost (127.0.0.1) Host is up (0.00022s latency). Not shown: 995 closed ports PORT STATE SERVICE 22/tcp open ssh 139/tcp open netbios-ssn 445/tcp open microsoft-ds 631/tcp open ipp 902/tcp open iss-realsecure Nmap done: 1 IP address (1 host up) scanned in 0.08 seconds Netcat configuration: I tried to make use of the following command to force the 9000 port to be open: nc -k -l 9000 but it did not work well (I was still not able to perform the standlone operation mentioned and linked above). Judging from my google research results, I see that the problem is quite common and poses a huge struggle especially for those who are not good at 'admin-job-related issues'. As I belong to those, I kindly ask for answers to the following questions: • Q1: What is the origin of such problem in general? (Some for a layman introductory words / references about basic issues connected to ports / connections etc. Would be very very welome). • Q2: How to deal with this problem? Sudo netstat -nlp| grep:9000 returns nothing. Hi @Rinzwind, thank you for your attention. I had visited this post (and tried the solutions provided) before posting this one. A careful reader would even notice my comment there, dated Apr 26 at 20:42:) Unfortunately, the solution that solved an issue in that case ('i got overlapping ip ports with some apps on my host machine (.) sudo kill $(sudo lsof -t -i:9000)afterwards everything was ok') does not work in mine case (in my case sudo lsof -t -i:9000 reports nothing). – Apr 30 '15 at 11:04. TL;DR first, more details following: 'Connection refused' is the error you get when you try to connect to a service on a computer or server (or locally on your own computer) when the said service is either not listening on the specified TCP port (wrong port or service not started), or when a firewall explicitly rejects a connection instead of ignoring the request (not very common behavior). And now a little more detail: It can only happen with TCP (UDP services are sessionless) and this error is indeed very common for sys admins. When a client application connects to a TCP service, it'll send a first packet with the SYN flag set. If we simplify, there are two possible answers to that: • The server actualy listens on the required TCP port and replies with a SYN-ACK packet to acknowledge the SYN packet, after which the clients rends an ACK packet to 'confirm' to the server that the SYN-ACK was received. That's the moment where you have established a TCP session, and when you can start 'talking' with the server. • The server receives your SYN packet, but isn't listening on the requested port. The connection is rejected with a packet that has the RST (reset) flag set. This is 99% of the time when you get the infamous 'connection refused'. Although the development team has moved full-stream-ahead on Linux, you can still use this excellent free video editor on Mac with packages available via. Definitely, HyperEngin-AV is really a good free video editor for Mac users. Features: • You can use it to create slide shows • Supports capturing desktop and editing video Pros: Includes twelve studio-quality effects; Create slide shows Cons: It is discontinued to release new version. Besides, it offers text features to display credits, section titles, or karaoke lyrics with fully editable font, size, type, color, style, alignment, and scroll direction. Best software for editing videos on mac. ![]() How do I fix this? Well, there are a few things you can check: Are you querying the right port on the client side? Is your service started? Is it listening on the right port? Those three questions will generally help you solve your issue.
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