Timeouts on access to S3 by redshift after maintenance update

Hi,

Last weekend 20/01/2024, after automatic maintenance upgrade of our provisioned redshift cluster (in eu-west-1a) to version 1.0.61678, all our LOAD commands started to fail. Also queries to "external" tables on S3 time out 100%. Regular queries still work normally, so it really looks to be a problem with the connectivity of redshift to S3 only.

Getting data from S3 from regular EC2 instances in same AZ still work as before, proving that VPC and routing tables are still fine (also: nothing else has changed besides this redshift maintenance update).

In STL_ERROR table, entries as below can be seen:

• Problem reading manifest file - S3CurlException: Resolving timed out after 50001 milliseconds, CurlE
• S3CurlException: Resolving timed out after 50001 milliseconds, CurlError 28, multiCurlError 0, CanRe

As there is no further visibility on this managed service, reached out to AWS support for investigation of this issue.

Anybody else experienced the same?

Wkr, Bert