EventBridge failing to invoke API Destination with SDK_CLIENT_ERROR suddenly

0

Hello,

We're using EventBridge to trigger an application API on a periodic basis. It is public facing and hosted on our EC2 instances, which is behind a Load Balancer.

It had been working fine up until the day the domain name's SSL certificate expired. However, after SSL cert had been renewed and re-imported via Certificate Manager, the error still persists (from the deadletterqueue):

NameValue
ERROR_CODESDK_CLIENT_ERROR
ERROR_MESSAGEUnable to invoke ApiDestination endpoint: API destination endpoint cannot be reached.
RULE_ARN...
TARGET_ARN...

Connection is Authorized, API Destination has been checked and works when called in the browser. Everything seems to be in order. Have tried re-creating new connection/APIDestination/new rule but hitting same error.

What might cause such an error "SDK_CLIENT_ERROR" ?

Thanks in advance.

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