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Troubleshooting

No ALB window?

  • Check that EuroScope has loaded ALB.dll.

  • Confirm that ALBCore.dll is present in the same plugin folder.

  • The window may stay hidden until .alb open

Messages not sending?

  • Verify FMR claimed and network status.

Backend seqsync status and control

Show current backend seqsync status with:

.alb seqsync status

Useful fields in the status output include:

  • current mode
  • recoveryDrain=0/1
  • queue depth
  • set2, del, and hclr queue counts
  • max queue age
  • queued ICAOs where relevant
  • peer health summary when enabled, such as peerHealth, peerAvgMs, peerMaxMs, peerWarnedLocal, and peerWarnedPeers

When ALB is in suspend, the status line also shows that canonical TX is suspended and that operational DEL remains allowed and rate-limited.

If passive peer health monitoring is enabled, the status line may also show the last warned peer and warning age.

If you are working as a non-FMR peer and use runway Advance 1 or Resequence, ALB may also report that the request was sent, accepted and waiting for canonical sync, or timed out if the authoritative reply path does not complete.

Change seqsync mode with:

.alb seqsync normal
.alb seqsync throttled
.alb seqsync horizon
.alb seqsync suspend

Seqsync diagnostics

For deeper technical inspection, look for PERF summary lines such as:

  • BACKEND_SEQ_SYNC_SUMMARY
  • BACKEND_SEQ_TX_THROTTLE
  • BACKEND_SEQ_HORIZON
  • BACKEND_SEQ_SUSPEND
  • BACKEND_SEQ_NORMAL_RECOVERY

Relevant field families include backendSeq.txQueue.*, backendSeq.horizon.*, backendSeq.suspend.*, backendSeq.normalRecoveryDrain.*, backendPeerHealth.*, and backend poll timing fields such as backendPoll.*.

If you are deliberately validating this behavior in a technical session, use:

.alb perftest peers on 300

See Backend Transport and Playback & Recording for the technical interpretation.