Network interruption during the session renewal request to Snowflake. The user's password or key-pair credentials were rotated/revoked between the initial connection and renewal. The Snowflake session policy has been changed to prevent renewals for the user's role. Snowflake service degradation causing the token renewal endpoint to be temporarily unavailable. The session idle timeout was reached while the renewal was in-flight (race condition)

Retry the operation — a transient network issue during renewal is often resolved on the next attempt.. Check if the user's credentials (password or key-pair) have been rotated and update the pipeline secrets.. Review the Snowflake session policy for the user's role: SHOW SESSION POLICIES and DESCRIBE SESSION POLICY.. For long-running operations, consider using a fresh connection at the start of each pipeline run rather than relying on renewal.. Check Snowflake's status page for service degradation in the target region.

High severityauthenticationSnowflake →

Power BI Refresh Error:
252007

What does this error mean?

The Python connector attempted to automatically renew the Snowflake session token but the renewal request failed. This interrupts long-running operations that rely on the connector's built-in session auto-renewal.

Common causes

1Network interruption during the session renewal request to Snowflake
2The user's password or key-pair credentials were rotated/revoked between the initial connection and renewal
3The Snowflake session policy has been changed to prevent renewals for the user's role
4Snowflake service degradation causing the token renewal endpoint to be temporarily unavailable
5The session idle timeout was reached while the renewal was in-flight (race condition)

How to fix it

1Retry the operation — a transient network issue during renewal is often resolved on the next attempt.
2Check if the user's credentials (password or key-pair) have been rotated and update the pipeline secrets.
3Review the Snowflake session policy for the user's role: SHOW SESSION POLICIES and DESCRIBE SESSION POLICY.
4For long-running operations, consider using a fresh connection at the start of each pipeline run rather than relying on renewal.
5Check Snowflake's status page for service degradation in the target region.

Frequently asked questions

How long does a Snowflake session last before renewal is needed?

Default session idle timeout is 4 hours, but this can be overridden by session policies. The connector renews automatically well before expiry for active connections.

Should I use connection pooling to avoid session renewal issues?

Connection pooling with pool_pre_ping=True is recommended for long-running applications. For batch pipelines, creating a fresh connection per run is simpler and avoids renewal edge cases.

Official documentation: https://github.com/snowflakedb/snowflake-connector-python/blob/main/src/snowflake/connector/errorcode.py