Mongodb failed to connect to server on first connect

Question

I get the following error   Warning   MongoError  failed to connect to server  mongodb 27017  on first connect     at Pool  lt anonymous gt    Users michaelks Desktop users node modules mongodb-core lib topologies server js 325 35      at emitOne  events js 96 13      at Pool emit  events js 188 7      at Connection  lt anonymous gt    Users michaelks Desktop users node modules mongodb-core lib connection pool js 270 12      at Connection g  events js 292 16      at emitTwo  events js 106 13      at Connection emit  events js 191 7      at Socket  lt anonymous gt    Users michaelks Desktop users node modules mongodb-core lib connection connection js 173 49      at Socket g  events js 292 16      at emitOne  events js 96 13      at Socket emit  events js 188 7      at connectErrorNT  net js 1025 8      at  combinedTickCallback  internal process next tick js 74 11      at process  tickCallback  internal process next tick js 98 9    name   MongoError     message   failed to connect to server  mongodb 27017  on first connect      Even though I get this in the terminal window where I run Mongo   2016-12-25T03 45 23 715 0100 I NETWORK  initandlisten  connection accepted from 127 0 0 1 58868  8  8 connections now open     It kinda looks like there is a connection    I ve tried both    mongod    and    brew services start mongo    This is my test helper js  const mongoose   require  mongoose    mongoose connect  mongodb localhost users test    mongoose connection   once  open        gt  console log  Good to go       on  error    error    gt     console warn  Warning   error          I have not specifically made the db  users test  as I am under the impression that mongoose or mongo or both will do this on the fly   I ve tried both  localhost  and  127 0 0 1    I m on OSX 10 11 5 I m running Node 7 3 0 and Mongo 3 2 9  What am I doing wrong  How do I figure out what s wrong

User · Answer

While connected to a wifi network  mongodb   localhost db name  worked as expected   When I wasn t connected to any wifi network  this couldn t work  Instead I used  mongodb   127 0 0 1 db name and it worked    Probably a problem to do with ip configurations

User · Answer

For me issue was mongo was not running So first i started  mongod  command in the console And later in another console tab I have run  mongo   Now the connection is successful  Now run your app your problem should be solved

User · Answer

I was trying to connect mlab with my company wifi connection and it was giving this error  But when I switched to personal network it worked and got connected

User · Answer

I was running mongod in a PowerShell instance  I was not getting any output in the powershell console from mongod  I clicked on the PowerShell instance where mongod was running  hit enter and and execution resumed  I am not sure what caused the execution to halt  but I can connect to this instance of mongo immediately now

User · Answer

I ran into this issue serval times  and  here is some troubleshooting list   make sure database path is exist  the default path in windows in C  data db make sure mongo is running  to run it go to C  Program Files MongoDB Server 3 4 bin and run the following    mongod exe mongo exe  make sure that your connection string is correct like mongodb   localhost database-name

User · Answer

I was getting same error while I tried to connect mlab db that is because my organization network has some restriction  I switched to mobile hotspot and it worked

User · Answer

Local MongoDb problem solution  solve it by following the below steps   Changed  mongodb   localhost 27017 local   to  localhost local   And the error gone

User · Answer

Adding one more answer as the solution is from different contexts    MongoDb Atlas problem solution  I connected to MongoDB Atlas and whitelisted my machine s IP by following the below steps    Go to the security tab      Go to the network access tab under the security tab      Go to the IP whitelist tab      Enter the IP address of your machine

User · Answer

if it is cluster MongoDB then you need to add your current IP to the cluster  to add your current IP address you need to complete few steps below-   step 1- go to login page of Mongodb and login with valid credential - https   cloud mongodb com user  atlas login step 2- CLick Network Access from left sidebar under Security Section Step 3 - Click Add IP Address Step 4 - Click Add Current IP Address or Allow Connection From Any Where now try to connect - npm start     and for Local MongoDB use mongo String like      mongodb srv   username pass 40ord clastername-blqnk mongodb net test retryWrites true amp w majority   password must be encoded like example string

User · Answer

If the mongo instance is build on the cloud mongodb com this error appears when the instance can work only from known IP addresses set in the IP whitelist pool when the instance was configured   So from the mongo dashboard need to be set the current IP address on the IP whitelist from network access menu on the left   BR

User · Answer

I tried all the method above   Allowed access from any db  Verified correct credentials of connection string  Created another user   Nothing of those worked for me  Finally  I created a new DB and switched to it   everything was fine  Luckily  it wasn t so important DB  for self education purpose  so the damage wasn t so big

User · Answer

I connected to a VPN and it worked  I was using school s WiFi

User · Answer

To connect to mongodb with mongoose  you can use    mongoose connect  mongodb   localhost users test      or  mongoose connect  localhost users test      or   mongoose connect  localhost   users test      But not mongoose connect  mongodb localhost users test     it doesnt match the right hostname  mongodb instead of localhost

User · Answer

In case of remote db in cloud such as ATLAS  you should create whitelist entry 0 0 0 0 0  This allows you to access your cluster ATLAS from any IP address

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