Subject: OpenCode Desktop Windows – recurring Connect Timeout Error while direct HTTPS access works

Description

Hello OpenCode Team,

I am experiencing a recurring connectivity problem in OpenCode Desktop on Windows.

The error is:

Cannot connect to API: Connect Timeout Error
(attempted addresses: 172.65.90.21:443,
2606:4700:78::90:0:142:443,
172.65.90.23:443,
2606:4700:78::90:0:140:443,
172.65.90.20:443,
2606:4700:78::90:0:141:443,
172.65.90.22:443,
2606:4700:78::90:0:143:443,
timeout: 10000ms)

This is reproducible and is not limited to a single model. The OpenCode log shows the same failure with multiple models, including:

muse-spark-1.2-contributor-free
muse-spark-1.3-contributor-free
mimo-v2.5-free

The failures occur repeatedly across September 11–13, 2026.

Local network tests

I tested the same machine outside OpenCode:

TCP connectivity:
Test-NetConnection 172.65.90.22 -Port 443
TcpTestSucceeded : True
HTTPS to OpenCode:
curl.exe -I -v --connect-timeout 10 https://opencode.ai/

Result:

HTTP/1.1 200 OK
HTTPS to Models.dev:
curl.exe -I -v --connect-timeout 10 https://models.dev/

Result:

HTTP/1.1 200 OK

Therefore, direct HTTPS connectivity from the Windows machine to both opencode.ai and models.dev works successfully.

OpenCode-specific behavior

However, OpenCode Desktop repeatedly logs:

Failed to fetch models.dev
cause=TimeoutError

and:

Cannot connect to API: Connect Timeout Error
timeout: 10000ms

The log also contains an earlier DNS error:

Cannot connect to API: getaddrinfo ENOTFOUND opencode.ai

although DNS resolution currently works from Windows.

I also tested PowerShell separately. Interestingly, curl.exe can reach models.dev and receives HTTP 200, while Invoke-WebRequest has at times reported:

The remote name could not be resolved: 'models.dev'

This suggests there may be a difference between the network/runtime stack used by OpenCode Desktop and the normal Windows command-line networking tools.

Additional log information

The OpenCode log also contains:

background dependency install failed
ReleaseError: token mismatch

which may indicate a cache/dependency problem, although I cannot confirm that this is the root cause.

The application version recorded in the log is:

1.18.30
Current environment
Windows
OpenCode Desktop
OpenCode Desktop version: 1.18.30
No HTTP_PROXY, HTTPS_PROXY, ALL_PROXY, or OPENCODE_* environment variables were found in PowerShell.
No API key or bearer token is included in the attached log excerpts.
Request

Could you please investigate whether this is a known Windows/OpenCode Desktop networking issue involving the Desktop runtime, Bun/Node/Undici networking, DNS resolution, IPv4/IPv6 handling, or models.dev connectivity?

In particular, I would appreciate clarification on why:

Windows curl → opencode.ai 200 OK
Windows curl → models.dev 200 OK
OpenCode Desktop → models.dev Timeout
OpenCode Desktop → API Connect Timeout

Please let me know whether there is a known fix, workaround, or diagnostic build for this issue.

I can provide the relevant sanitized log excerpts and additional diagnostic results if needed.

Thank you.

Best regards,

Plugins

No response

OpenCode version

No response

Steps to reproduce

No response

Screenshot and/or share link

No response

Operating System

Windows11

Terminal

powershell