Two bugs caught by live verification against the mxaccessgw at 10.100.0.48:5120:
- MaxAttempts=1 produced an invalid Polly RetryStrategyOptions -> the probe failed
on every real gateway. Removed the Retry override (matches GalaxyDriver); fail-fast
is already guaranteed by the TCP preflight + the per-call deadline.
- A rejected key surfaces as a typed MxGatewayAuthenticationException, not a raw
RpcException, so 'auth-rejection = reachable' was bypassed. Catch the typed auth/
authorization exceptions -> Ok=true.
Adds DriverProbeHandshakeE2eTests: direct-probe, skip-gated cross-protocol green/red
discrimination (Modbus, OpcUaClient, Galaxy + a local real OPC UA server).
Create docs/drivers/TestConnectProbes.md: full reference for the Phase 5
protocol-handshake probes — result contract, per-driver handshake table,
TwinCAT/FOCAS/Galaxy degrade semantics, live-verify scope, and the
Historian.Wonderware already-done note. Annotate the Phase 7 step in
docs/plans/2026-05-28-adminui-driver-pages-design.md with a shipped note
pointing at the phase-5 design doc and TestConnectProbes.md.
Joseph Doherty