roachtest: ssh_problem failed

roachtest.ssh_problem [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyGceBazel/21421965?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyGceBazel/21421965?buildTab=artifacts#/kv95/enc=false/nodes=3/cpu=32/mvcc-range-keys=global) on release-25.2.22-rc @ [2104a30430492bf810437ec7c36637226dc8be04](https://github.com/cockroachdb/cockroach/commits/2104a30430492bf810437ec7c36637226dc8be04):

```
test kv95/enc=false/nodes=3/cpu=32/mvcc-range-keys=global failed: (test_runner.go:840).func4: cluster.PutE: put "/go/src/github.com/cockroachdb/cockroach/bin/cockroach.linux-amd64" failed: error persisted after 2 attempts: TRANSIENT_ERROR(ssh_problem): ~ scp -r -C -o StrictHostKeyChecking=no -o ConnectTimeout=10 -i /home/roach/.ssh/id_rsa /go/src/github.com/cockroachdb/cockroach/bin/cockroach.linux-amd64 ubuntu@34.75.63.26:./cockroach
ssh: connect to host 34.75.63.26 port 22: Connection refused
lost connection: exit status 1 [owner=test-eng]
```

Parameters:
- MetamorphicFilesystem=ext4
- MetamorphicVolumeType=pd-ssd
- arch=amd64
- cloud=gce
- coverageBuild=false
- cpu=32
- diskCount=0
- encrypted=false
- fs=ext4
- localSSD=false
- runtimeAssertionsBuild=false
Help

See: [roachtest README](https://github.com/cockroachdb/cockroach/blob/master/pkg/cmd/roachtest/README.md)

See: [How To Investigate \(internal\)](https://cockroachlabs.atlassian.net/l/c/SSSBr8c7)

See: [Grafana](https://go.crdb.dev/roachtest-grafana/teamcity-21421965/kv95-enc-false-nodes-3-cpu-32-mvcc-range-keys-global/-62135596800000/-62135596680000)

Same failure on other branches

- #172515 roachtest: ssh_problem failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-26.1.8-rc]
- #172363 roachtest: ssh_problem failed [O-roachtest O-robot T-testeng X-infra-flake branch-master]
- #172359 roachtest: ssh_problem failed [O-roachtest O-robot T-testeng X-infra-flake branch-master]
- #171649 roachtest: ssh_problem failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.2.20-rc]
- #171630 roachtest: ssh_problem failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-26.1.6-rc]
- #171625 roachtest: ssh_problem failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.4.12-rc]

/cc @cockroachlabs/test-eng

[This test on roachdash](https://roachdash.crdb.dev/?filter=status:open%20t:.*ssh_problem.*&sort=title+created&display=lastcommented+project) | [Improve this report!](https://github.com/cockroachdb/cockroach/tree/master/pkg/cmd/bazci/githubpost/issues)

Jira issue: CRDB-65765

Start with the roachtest README and the failure at test_runner.go:840, then trace cluster.PutE and the reported scp/SSH connection refusal. Review the linked TeamCity logs, artifacts, and Grafana data to determine the failure pattern; done means identifying and addressing the recurring ssh_problem across the listed branches.

Written by the indexing model from the issue text.