jdk_security3_1 sun/security/tools/jarsigner/TimestampCheck.java KeyStoreException: Unrecognized keystore format, SocketException: Connection reset

[JasonFengJ9]

Failure link

From internal Test_openjdk21_j9_extended.openjdk_x86-64_windows_testList_0 (rtj-win19x86-rtp-vstest-2)

openjdk version "21.0.9" 2025-10-21 LTS
IBM Semeru Runtime Open Edition 21.0.9.0-m2 (build 21.0.9+9-LTS)
Eclipse OpenJ9 VM 21.0.9.0-m2 (build 21.0.9+9-v0.56.0-release-12fce2816a, JRE 21 Windows Server 2019 amd64-64-Bit Compressed References 20251021_567 (JIT enabled, AOT enabled)
OpenJ9   - 12fce2816a
OMR      - a68be5f3d
JCL      - cc8a574f313 based on jdk-21.0.9+9)

Rerun in Grinder - Change TARGET to run only the failed test targets

Optional info

Failure output (captured from console output)

[2025-10-09T15:48:38.926Z] Running test jdk_security3_1 ...
[2025-10-09T15:48:38.926Z] ===============================================
[2025-10-09T15:48:39.879Z] jdk_security3_1 Start Time: Thu Oct  9 08:48:39 2025 Epoch Time (ms): 1760024919135
[2025-10-09T15:48:39.879Z] variation: Mode650
[2025-10-09T15:48:40.814Z] JVM_OPTIONS:  -XX:-UseCompressedOops -Xverbosegclog 

[2025-10-09T19:20:06.038Z] TEST: sun/security/tools/jarsigner/TimestampCheck.java

[2025-10-09T19:20:06.057Z] keytool error: java.security.KeyStoreException: Unrecognized keystore format. Please load it with a specified type

[2025-10-09T19:20:06.061Z] TEST RESULT: Error. Agent communication error: java.net.SocketException: Connection reset; check console log for any additional details
[2025-10-09T19:20:06.061Z] --------------------------------------------------
[2025-10-09T20:05:40.820Z] Test results: passed: 964; error: 1

50x internal Grinder - 5 keytool error were reproduced

FYI @jasonkatonica