Client application reports "503 Service Unavailable" when performing the HEAD request in StorageGRID

Applies to

• StorageGRID 11.x
• MSSQL Agent Backup

Issue

Client application reports "503 Service Unavailable" when performing the HEAD request in StorageGRID

90902 1f9b2 06/12 18:32:16 1258694 [cvd] => HEAD http://<PATH>.
90902 1f9b2 06/12 18:32:16 1258694 [cvd] => x-amz-date: 20250612T183206Z
90902 1f9b2 06/12 18:32:16 1258694 [cvd] => x-amz-content-sha256: 
90902 1f9b2 06/12 18:32:16 1258694 [cvd] => Authorization:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
90902 1f9b2 06/12 18:32:16 1258694 [cvd] <= HTTP/1.1 503 Service Unavailable

StorageGRID bycast.log reports as below

Jun 13 02:03:33 < Node_Name > ADE: |12413039 0446794696 S3RQ %CEA 2025-06-13T02:03:33.863388| NOTICE   1255 <Trace_ID> S3RQ: EVENT_PROCESS_CREATE - connection=< REQUEST_ID > method=HEAD name=<< PATH >> auth=<V4> clientIP=<< CLIENT_IP >>

Jun 13 02:03:33 < Node_Name > ADE: |12413039 0446794698 OBDR ^RDY 2025-06-13T02:03:33.871708| NOTICE   0418 <Trace_ID> OBDR: Metadata request failed for unknown '<PATH>', object temporarily unavailable as it may have been modified

Jun 13 02:03:33 < Node_Name > ADE: |12413039 0446794696 S3RQ %DED 2025-06-13T02:03:33.872132| NOTICE   0140 <Trace_ID> S3RQ: S3 error response: RequestId=< REQUEST_ID >, TraceId=0ecc5a3ffbb6a360, Resource=< PATH >, HTTP Method=HEAD, HTTP Status Code=503, X-Forwarded-For: '< CLIENT_IP >', ErrorMsg=ServiceUnavailable, ErrorType=Client, CustomErrorMessage={None}, Details={None}