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ARP no longer detects file extensions that it has never been seen before

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Applies to

Issue

  • Autonomous Ransomware Protection no longer detects low-entropy file extensions in System Manager that it has never seen before while EMS raise the ARP event:

callhome.arw.activity.seen: Call-home message for vol1 (UUID: volume-uuid) Vserver-01 (UUID: Vserver-UUID)

  • There is no ARP menu under Storage > Volumes > Security > Anti-Ransomware , it displays some gray blank bars.
  • ARP report or security anti-ransomware volume workload-behavior show can display the detected file extensions.
  • System Manager REST APIs /api/storage/volumes  fails:

Wed May 28 2025 10:45:59 +09:00 [kern_audit:info:8832]cluster: http :: cluster-mgmt:52791 :: cluster:admin :: GET /api/storage/volumes/vol1_uuid?fields=anti_ransomware%2Canti_ransomware.state%2Cuuid%2Cstate%2Cis_svm_root%2Ctype%2Cstyle%2Csnaplock%2Csvm%2Canti_ransomware.dry_run_start_time%2Canti_ransomware.attack_probability%2C%2C%2C%2Cflexcache_endpoint_type&return_timeout=120 HTTP/1.1 : ["X-Dot-Client-App: SMv4"] :: Error: 502 Proxy Error

  • MGWD log shows invalid value included in the report file when response to System Manager REST API /api/storage/volumes :

Wed May 28 2025 10:45:59 +09:00 [kern_mgwd:error:3086] Report file have invalid values: "   " [ARW_LOG src/tables/antiransomware/arw_util.cc:748 in 'parse_report_file_line']

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