Fix SSH auth failures by enforcing IdentitiesOnly=yes #4095
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When a specific ssh key is provided via `-i` or IdentityFile option,the SSH client may still attempt to iterate through all keys loaded in the ssh-agent first. If too many keys are loaded, this causes the server to reject the connection with "Too many authentication failures" before the correct key is attempted.
hamza-db
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andrewnester,
anton-107,
denik,
pietern and
shreyas-goenka
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ilia-db
approved these changes
Jan 5, 2026
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Commit: eecc3a2
21 interesting tests: 14 KNOWN, 4 RECOVERED, 2 flaky, 1 SKIP
Top 39 slowest tests (at least 2 minutes):
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Collaborator
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Commit: 833cf5a
23 interesting tests: 14 KNOWN, 4 RECOVERED, 4 flaky, 1 SKIP
Top 50 slowest tests (at least 2 minutes):
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Changes
I faced this issue myself when trying the expermental ssh tunnel. since I have couple of keys loaded into my ssh-agent
When a specific ssh key is provided via
-ior IdentityFile option,the SSH client still attempt to auth using all keys loaded in the ssh-agent first. If too many keys are loaded, this causes the server to reject the connection with "Too many authentication failures" before the correct key is attempted.Why
Tests
manually tested the change