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To silence a warning, in rare failure cases:
```
srclimit_penalise: ipv4: new 172.17.0.1/32 deferred penalty of 1.000
seconds for penalty: connections without attempting authentication
```
Ref: https://github.com/libssh2/libssh2/actions/runs/37207427612/job/111451438515?pr=2649#step:25:537
Also:
- seize the opportunity and bump sshd debug level to 2.
Level 1 is too low to see clearly in some cases.
Ref: https://github.com/libssh2/libssh2/pull/2649
Follow-up to 45aa5c5fa4 #2621
Refs:
https://man.openbsd.org/sshd_config#PerSourcePenalties
https://www.openssh.org/txt/release-9.8
Closes #2650