MongoNetworkError failed to connect to server localhost 27017 on first connect MongoNetworkError connect ECONNREFUSED 127 0 0 1 27017

Question

I m new in nodeJS  started learning by following a trailer on youtube  everything goes well until I added the connect function if mongodb   mongo connect  mongodb   localhost 27017 mydb     when I run my code on cmd  node start-app   get the following error    MongoNetworkError  failed to connect to server  localhost 27017  on first connect  MongoNetworkError  connect ECONNREFUSED 127 0 0 1 27017    Could someone explain me which step I missed    my code     var express   require  express    var MongoClient   require  mongodb    var url    mongodb   localhost 27017 mydb   var webService   require    webService    var server   express     MongoClient connect url  function  err  db        if  err  throw err      console log  Database created         db close         server use express urlencoded   extended  true       server set  views     dirname    server get      function  request  response        response sendFile   dirname     MainPage html         server get   Sign   function  request  response        response render   dirname     Sign ejs         server post   signUp   webService signUp    server post   createUser   webService createUser    server listen 5500

User · Answer

first create folder by command line  mkdir C  data db  This is for database  then run command   mongod --port 27018  by one command prompt administration mode - you can give name port number as your wish

User · Answer

just install MongoDB on your system  That s it

User · Answer

1  If you haven t installed mongodb  install it   2  open a new terminal  type  mongo   This is going to connect you to a MongoDB instance running on your localhost with default port 27017

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I had this issue while working at the local Starbucks and I remembered that when I initially set up my database through Mongo Atlas  I set my IP address to be able to access the database  After looking through several threads  I changed my IP address on Atlas and the issue went away  Hope this helps someone

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I don t know if this might be helpful  but when I did this it worked  Command mongo in terminal  Then I copied the URL which mongo command returns  something like mongodb   127 0 0 1  port   I replaced the URL with this in my JS code

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This had occurred to me and I have found out that it was because of faulty internet connection  If I use the public wifi at my place  which blocks various websites for security reasons  Mongo refuses to connect  But if I were to use my own mobile data  I can connect to the database

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Your firewall blocked port 27017 which used to connect to MongoDB  Try to find which firewall is being used in your system  e g  in my case is csf  config file placed at  etc csf csf conf  find TCP IN  amp  TCP OUT as follow and add port 27017 to allowed incoming and outgoing ports   Allow incoming TCP ports TCP IN    quot 20 21 22 25 53 80 110 143 443 465 587 993 995 2222 27017 quot     Allow outgoing TCP ports TCP OUT    quot 20 21 22 25 53 80 110 113 443 587 993 995 2222 27017 quot   Save config file and restart csf to apply it  csf -r

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just run mongod in terminal on the base folder if everything has been set up like installing mongo db and the client for it like mongoose  After running the command run the project file that you are working on and then the error shouldn t appear

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You have to install MongoDB database server first in your system and start it   Use the below link to install MongoDB  https   docs mongodb com manual installation

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If the mongoDB server is already installed and if you are unable to connect from a remote host then follow the below steps  Login to your machine  open mongodb configuration file located at  etc mongod conf  and change the bindIp field to specific ip   0 0 0 0   after that restart mongodb server      sudo vi  etc mongod conf   The file should contain the following kind of content    systemLog        destination  file       path   quot  var log mongodb mongod log quot        logAppend  true   storage        journal            enabled  true   processManagement        fork  true   net        bindIp  127 0 0 1     change here to 0 0 0 0       port  27017   setParameter        enableLocalhostAuthBypass  false   Once you change the bindIp  then you have to restart the mongodb  using the following command   sudo service mongod restart   Now you ll be able to connect to the mongodb server  from remote server

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My case was a little different  After restarting my system  I had not whitelisted my IP address on Mongo while doing local development    Select Network Access  gt  Add IP Address  gt  Add your current IP Address

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I faced same issue but after a lot of RND  I found that whts the problem so run this command on your terminal   sudo service mongod start  then run mongo on terminal

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Many of them don t add this  especially in AWS EC2 Instance  I had the same issue and tried different solutions   Solution   one of my database URL inside the code was missing this parameter  authSource   adding this worked for me   mongodb   myUserName MyPassword ElasticIP 27017 databaseName authSource admin

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You can check detail of error by running this command  sudo service mongod status  if error is something like this   Failed to unlink socket file  tmp mongodb-27017 sock Unknown error Fatal Assertion 40486 at src mongo transport transport layer asio cpp 670   simply running this will resolve your issue  rm  tmp mongodb-27017 sock

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If Install before Mongodb Just Start with this code     brew services start mongodb-community next   gt  mongod      If Not Install before this Way   1 brew tap mongodb brew 2 brew install mongodb-community 3 brew services start mongodb-community 4 mongod

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I guess you must be connecting to cloud mongodb com to your cluster   One quick fix is to go to the connection tab and add your current IP address in the cluster portal of browser or desktop app   The IP address must have changed due to a variety of reasons  such as changing the wifi   Just try this approach  it worked for me when I got this error

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This worked for me   mongoose Promise   global Promise       connect       mongodb   127 0 0 1 27017 mydb         useNewUrlParser  true  useCreateIndex  true  useUnifiedTopology  true   then db   gt          console log  Database connected           catch error   gt  console log  Could not connect to mongo db     error      I was using localhost  so i changed it to   mongodb   127 0 0 1 27017 mydb

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After trying EVERY solution google came up with on stack overflow  I found what my particular problem was  I had edited my hosts file a long time ago to allow me to access my localhost from my virtualbox   Removing this entry solved it for me  along with the correct installation of mongoDB from the link given in the above solution  and including the correct promise handling code   mongoose connect  mongodb   localhost testdb   then      gt    console log  Connected to Database       catch  err    gt        console log  Not Connected to Database ERROR     err

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I connected to a VPN and the connection accomplished  I was using school s WiFi which has some restrictions apparently

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Following the logic behind  CoryM s answer above    After trying EVERY solution google came up with on stack overflow  I found what my particular problem was  I had edited my hosts file a long time ago to allow me to access my localhost from my virtualbox  Removing this entry solved it for me     I had edited my hosts file too for Python Machine Learning setup 2 months ago  So instead of removing it because I still need it  I use 127 0 0 1 in place of localhost and it worked   mongoose connect  mongodb   127 0 0 1 testdb

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this might help someone if you installed your mongo on  msi setup kindly open the software and select repair instead of install  and try again  that works for me

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You need to initialize your mongoDB database first  you can run  mongod  in your terminal and then it will be working fine

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mongoose connect  mongodb   localhost 27017    then      gt    console log  Connected to Database       catch  err    gt    console log  Not Connected to Database ERROR     err         Better just connect to the localhost Mongoose Database only and create your own collections  Don t forget to mention the port number   Default  27017   For the best view  download Mongoose-compass for MongoDB UI

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This one helped me  Try creating a new folder  if your MongoDB is installed in C  Program Files the folder should be called db and in a folder data  C  data db  When you start the mongod there should be a log where the db  isnt found

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My problem was the wrong port number for mongoDB server  I had  DATABASE URL   quot mongodb   localhost 3000 node-express-mongodb-server quot   in my  env file  my environmental variables   but I had written it before running mongoDB server  So when I ran the mongoDB server  it wrote a different port number and I had to change it  I changed it to the right port number  which was written on my cmd window by mongoDB   DATABASE URL   quot mongodb   localhost 27017 node-express-mongodb-server quot   and now it works fine

User · Answer

You re IP address probably changed   If you ve recently restarted your modem  this changes your IP which was probably whitelisted on Atlas    Soooo  you ll need to jump back onto Atlas and add your new IP address to the whitelist under Security Network Access

[node.js] MongoNetworkError: failed to connect to server [localhost:27017] on first connect [MongoNetworkError: connect ECONNREFUSED 127.0.0.1:27017]

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