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Simulator Connector Installation

  • April 23, 2026
  • 6 replies
  • 46 views

Hi,
I am trying to install Prosper, GAP and Unisim connectors but the instalation is failing for all of them.
It just says that it cannot start the service and that is the only message I got


Start-Service : Failed to start service 'Cognite GAP connector 2.0.0-beta-6 (GapConnector)'.
At line:1 char:1
+ Start-Service GapConnector
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : OpenError: (System.ServiceProcess.ServiceController:ServiceController) [Start-Service],
ServiceCommandException
+ FullyQualifiedErrorId : StartServiceFailed,Microsoft.PowerShell.Commands.StartServiceCommand

 

Best answer by vikram.chawan

Got it. Can you confirm if the .NET runtime is installed on the VM? Connector requires .net installed to work.

6 replies

vikram.chawan
Practitioner ⭐️⭐️⭐️
  • Practitioner ⭐️⭐️⭐️
  • April 23, 2026

Hi Ricardo,

Thank you for your interest in the Prosper/GAP connectors.

We had below clarifying question from our end, it will help us to debug this issue.

Can you confirm if you have a file named config.yml under config folder with correct credentials? Usually the installer ships only example files, not a ready-to-use config. The user must create config\config.yml from the minimal example and provide real credentials before the service can start. 

Also can you check in the Prosper/Gap installation folder if you can find log folder - it should have some log files underneath if generated? Would be great if that can be shared as well. 


  • Author
  • Seasoned ⭐️⭐️
  • April 24, 2026

Yes, I have the config. I installed Unisim connector in another VM and I followed the same structure
The log folder was not even created, it seems the instalation crashed before that

 


vikram.chawan
Practitioner ⭐️⭐️⭐️
  • Practitioner ⭐️⭐️⭐️
  • Answer
  • April 24, 2026

Got it. Can you confirm if the .NET runtime is installed on the VM? Connector requires .net installed to work.


  • Author
  • Seasoned ⭐️⭐️
  • April 24, 2026

We reinstalled everything and it worked for Prosper and GAP. I’m not sure what we missed though

But we still have errors for UNISIM. It says we must install or update .NET, but we have it and the version is 8.0.26

We also have another VM with a running unisim connector with different versions of .NET as well
 

.NET VM with a running Unisim connector

 


  • Author
  • Seasoned ⭐️⭐️
  • April 24, 2026

It is working now :)


Peter  Arwanitis
Practitioner ⭐️⭐️⭐️
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  • Practitioner ⭐️⭐️⭐️
  • April 24, 2026

Very glad to hear that t is working now!

On our AKBP chat you mentioned that it could be related to .NET version dependencies.

--

For others maybe having similar problems:

In general working with Windows Services it is always good to check “Windows Event Viewer” for logs, here a screenshot from my computer with a test installation, but broken config file


A more “expert approach” which I try, is to to rune the extractor/connector from commandline from the folder the `config.yaml` is in (not as a service), that way access to logs is immediate, but YMMV. Again a from a test session on my computer, where problem with my config are easy to see, fix and re-run.

# cd into the folder the GapConnector was installed to
PS C:\Cognite\GapConnector> .\bin\GapConnectorService.exe

# I've copied the config/config.minimal.yml here, w/o any changes and no ENV variables configured
PS C:\Cognite\GapConnector> ls

Directory: C:\Cognite\GapConnector
Mode LastWriteTime Length Name
---- ------------- ------ ----
d----- 23.04.2026 16:58 bin
d----- 23.04.2026 17:00 config
-a---- 16.02.2026 11:42 478 config.yml

# running the connector from commandline for a test
PS C:\Cognite\GapConnector> .\bin\GapConnectorService.exe
[2026-04-23 15:10:02.073 ERR] Failed to load configuration file: Failed to load config at Line: 16, Col: 16, Idx: 320: is not a valid value for Int64. (Parameter 'value')
[2026-04-23 15:10:02.092 ERR] Failed to load configuration file: Failed to load config at Line: 16, Col: 16, Idx: 320: is not a valid value for Int64. (Parameter 'value')
[2026-04-23 15:10:02.096 ERR] Failed to load configuration file: Failed to load config at Line: 16, Col: 16, Idx: 320: is not a valid value for Int64. (Parameter 'value')