Power BI Azure Cosmos DB v2 Connector – Connection Error

Hi risfy2025 

This type of error (a "Cannot connect" message with an empty details field) has been reported by others and may be related to a few common causes specific to the v2 Azure Cosmos DB connector in Power BI:

Possible Causes:

1. Missing or outdated .NET Framework components – the v2 connector may rely on specific runtime components that are not present on your machine, even if they exist on others.

2. Proxy or firewall settings – check if this PC is behind a proxy or has firewall rules that block specific outbound calls. The v2 connector uses different endpoints or protocols than v1.

3. Power BI Desktop version – you mentioned 2.144.XXX, which should be March 2024. Try upgrading to the latest version or testing with a slightly earlier build (some builds introduced silent breaking changes).

4. Credential cache corruption – try deleting the cached credentials from:
   File > Options and settings > Data source settings > Clear Permissions
   and restart Power BI.

5. Authentication method mismatch – the v2 connector may be trying to use a different authentication protocol (e.g., Managed Identity or OAuth2) which isn't supported on your local environment due to configuration issues.

Logs and Troubleshooting Steps:

• Check Power BI logs located at:
  C:\Users\<YourUsername>\AppData\Local\Microsoft\Power BI Desktop\Traces
  Open the latest .txt file and search for CosmosDB, v2, or any timestamp around your last connection attempt.

• Enable tracing (from Options > Diagnostics) and reproduce the error – this gives more verbose logs.

Additional Suggestions:

• Try to connect via the v2 connector on a different user profile on the same PC to rule out profile-level issues.

• If it works on other PCs but not this one, use Fiddler or Wireshark to compare network traffic between the working and failing machine (look for blocked ports or DNS issues).

If this post helps, then please consider Accepting it as the solution to help the other members find it more quickly