If your project is connected to Snowflake, your server logs might show the following message:
WARNING!!! using fail-open to connect. Driver is connecting to an HTTPS endpoint without OCSP based Certificated Revocation checking as it could not obtain a valid OCSP Response to use from the CA OCSP responder. Details: AggregateError"
This is just a warning and should have no impact on the connection.
Quote from the snowflake-sdk team in a closed GitHub issue:
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seems to be related how the OCSP local cache entries are only valid for a certain number of hours and after that period, they are considered expired.
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Since the default behaviour of the driver is OCSP Fail-Open this is indeed just a warning in the logs and should not block the connection actually commencing.