'CosmosDB emulator can't start since port is already in use

I'm giving CosmosDB a chance and so I decided to build an app that uses it, but I'm running into this issue when using the emulator: Port is already in use.

I'm not sure where to reconfigure the port the emulator is pointing.

windows azure-cosmosdb

Solution 1:^[1]

You can use /Port option to configure the emulator to listen to a different port.

https://docs.microsoft.com/en-us/azure/cosmos-db/local-emulator#a-idcommand-lineacommand-line-tool-reference

Solution 2:^[2]

I had a similar problem, where i got an error "port 10253 already in use" which is a port for Direct connectivity. Direct connectivity port defaults for CosmosDB are 10251,10252,10253,10254.

Used the following Command-line Syntax to change the default port and it worked,

CosmosDB.Emulator.exe /DirectPorts=10261,10262,10263,10264

OR (in my case)

"C:\Program Files\Azure Cosmos DB Emulator\CosmosDB.Emulator.exe" /DirectPorts=10261,10262,10263,10264

Note: You can use port of your choice, but make sure that they are not already in use

Solution 3:^[3]

The CosmosDbEmulator comes with a PowerShell module, which you can use to control it.

To get started using the module run the following command:

 Import-Module "$env:ProgramFiles\Azure Cosmos DB Emulator\PSModules\Microsoft.Azure.CosmosDB.Emulator"

Start the CosmosDbEmulator on a port of your choice, e.g 8082 as follows:

Start-CosmosDbEmulator -port 8082

Solution 4:^[4]

I finally got it working with powershell.

Import module

$env:PSModulesPath += "$env:ProgramFiles\Azure Cosmos DB Emulator\PSModules"
Import-Module Microsoft.Azure.CosmosDB.Emulator

Stop CosmosDB emulator

Stop-CosmosDbEmulator

Start CosmosDB emulator with prefered port

Start-CosmosDbEmulator  -Port 10101

And I got it working... Hope this helps.

Solution 5:^[5]

If you prefer just to change the Windows Shortcut, right click > properties and add /port=8082 (or whatever port number you want) at the end of the Target field after the quotes.

Note that in the Emulator Data Explorer, the URI field still showed the default port of 8081.

Solution 6:^[6]

With the latest (2.14.3) that I installed today, you need to specify /mongoport instead of /port.

Solution 7:^[7]

Check your processes list and find one like Microsoft.Azure.Cosmos.GatewayService.exe. Kill it. Then I can start Cosmos emulator.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1	Siddhesh Vethe
Solution 2
Solution 3	Mwiza
Solution 4	Bryan van Rijn
Solution 5	stu0292
Solution 6	Jonathan Brown
Solution 7	fkpwolf

'CosmosDB emulator can't start since port is already in use

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