[Bug]: attach-mode fails for ssh backend Task instance

[deep-diver]

Steps to reproduce

0. Add ssh backend instance to default-pool

1. Open up GitHub codespaces for a clear and fresh setup

2. run dstack config ...

3. run dstack init ...

4. run dstack run . -f ... --reuse

5. select the instance from the default-pool

Actual behaviour

fast-rat-1 provisioning completed (running)
Aborted
Traceback (most recent call last):
  File "/home/codespace/.python/current/bin/dstack", line 8, in <module>
    sys.exit(main())
  File "/usr/local/python/3.10.13/lib/python3.10/site-packages/dstack/_internal/cli/main.py", line 67, in main
    args.func(args)
  File "/usr/local/python/3.10.13/lib/python3.10/site-packages/dstack/_internal/cli/commands/run.py", line 183, in _command
    if run.attach():
  File "/usr/local/python/3.10.13/lib/python3.10/site-packages/dstack/api/_public/runs.py", line 293, in attach
    self._ssh_attach.attach()
  File "/usr/local/python/3.10.13/lib/python3.10/site-packages/dstack/_internal/core/services/ssh/attach.py", line 136, in attach
    raise SSHError("Can't connect to the remote host")
dstack._internal.core.errors.SSHError: Can't connect to the remote host

Expected behaviour

it should be able to connect to the provisioned instance

dstack version

0.18.1

Server logs

no server logs

Additional information

No response

[TheBits]

Hi, Chunsung!
Thanks for bug report!

Are you using dstack server or dstack Sky?

I fixed it in the dstack server, and it should work in the next version.

[deep-diver]

I am using dstack Sky, but this nodes are added by @peterschmidt85 for testing purpose

[TheBits]

I'll close the issue; the fixes will be in 0.18.2rc2.