Power BI Refresh Error:
250003

What does this error mean?

The Python connector could not complete an HTTP request to the Snowflake service. This is a network-level failure occurring after the connection was established — typically due to a transient network error, proxy interruption, or Snowflake service timeout.

Common causes

• 1Transient network interruption between the client and Snowflake during a request
• 2Proxy or firewall terminating long-running HTTP connections mid-flight
• 3Snowflake service returning an unexpected or malformed HTTP response
• 4DNS resolution failure on a subsequent request after initial connection
• 5Request timeout set too low for large result sets or slow queries

How to fix it

1. 1Retry the operation — error 250003 is often transient and resolves on the next attempt.
2. 2Check network stability and proxy logs for connection resets around the failure time.
3. 3Increase the login timeout: snowflake.connector.connect(..., login_timeout=60, network_timeout=60).
4. 4If behind a proxy, verify HTTPS_PROXY is set correctly and the proxy supports persistent connections.
5. 5Enable retry in the connector: use the retry_count and retry_delay parameters or wrap calls in a retry loop.

Frequently asked questions

Other connection errors