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[bug] Coder Connect on Windows: DNS publishing silently fails — workspace lookups return empty answers despite Connect being on

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#170 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
38/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Quiet
Tech stack
csharp
Domain
devops, networking

Research direction

Reproduce the failure with Resolve-DnsName against fd60:627a:a42b::53, then inspect the Coder Connect Windows service, Wintun adapter, NRPT rule, and CoderVpnService behavior. Done means workspace.coder queries return an IP address and restarting the Coder Desktop service preserves the adapter, rule, and service registration.

Written by the indexing model from the issue text.

Description

bug github-sync

Version: 0.8.3 (latest)
OS: Windows 11 Pro 10.0.26200

Symptom

Coder Desktop GUI reports Connect is ON, workspaces are listed, but no workspace hostname (<workspace>.coder) actually resolves via DNS. Apps that rely on Coder Connect for hostname routing (in our case, Claude Desktop's bundled SSH client which cannot use ~/.ssh/config ProxyCommand) time out at the SSH handshake step because no IP is returned.

What's set up correctly

  • Wintun adapter "Coder" is Up with a fd60:627a:a42b::/64 IPv6 prefix
  • Get-DnsClientNrptRule shows .coder → fd60:627a:a42b::53
  • TCP/53 on the Coder DNS server is reachable
  • coder users show me succeeds — CLI is authenticated to our deployment

What fails

Direct query to the embedded DNS:

> Resolve-DnsName -Name myworkspace.coder -Server fd60:627a:a42b::53
(empty answer — no IPAddress, no NXDOMAIN)

> ssh -F nul -o ConnectTimeout=15 coder@myworkspace.coder "echo OK"
ssh: Could not resolve hostname myworkspace.coder: No such host is known.

Queries succeed only when going via the ~/.ssh/config ProxyCommand (coder.exe ssh --stdio) — i.e., bypassing Coder Connect entirely. OpenSSH with verbose shows Authenticated to myworkspace.coder (via proxy).

Additional observation

Restarting the "Coder Desktop" Windows service while signed in deletes the Wintun adapter, the NRPT rule, and the CoderVpnService entry. Recovery requires toggling Connect OFF/ON in the tray app — the service restart alone leaves the system in a broken state.

Impact

Any third-party app that integrates with Coder via direct DNS + TCP (no ProxyCommand support) — e.g., Claude Desktop's "Add SSH connection" feature — cannot reach workspaces, even when the GUI says Connect is healthy.

Dominant language
C#
Stars
29
Forks
12
Avg merge
4h 15m
Merged PRs (30d)
2

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First steps

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

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