[BUG] indows 11 Pro: Cowork, Connectors, and Claude Code all broken after latest auto-update — ERR_CONNECTION_RESET + OAuthError

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

What's Wrong?
After the latest Claude Desktop auto-update, all three premium features stopped working simultaneously on Windows 11 Pro. Only basic Chat still functions.
Error 1 — Cowork:
Failed to start Claude's workspace
Request error: net::ERR_CONNECTION_RESET
Sometimes alternates with net::ERR_CONNECTION_ABORTED.
Error 2 — Connectors:
Could not load connectors directory
Could not attach to MCP server Kapture Browser Automation
Error 3 — Claude Code (in Desktop):
Error invoking remote method '$eipc_message$_45a8c035-be9c-4c52-b315-81a10e384931_$_claude.web_$_LocalSessions_$_start':
OAuthError: Unable to start session. Check your internet connection and try again.
Important context: Everything was working perfectly before the last auto-update. The update broke all three features simultaneously.
Environment

OS: Windows 11 Pro (latest)
Claude Desktop: Latest version (auto-updated)
Plan: Max ($100/month)
Internet: Working perfectly — Chat mode works fine
Antivirus: Kaspersky (tested with it completely disabled — same errors)
No VPN active

Everything I've tried (all failed):

Restarting Claude Desktop multiple times
Reinstalling workspace from in-app prompt
Full uninstall + reinstall of Claude Desktop (got 0x80073CF6 AddPackage failed during reinstall due to residual packages)
Restarting PC and router
Enabling Hyper-V (vmms service now running)
Manually starting CoworkVMService via PowerShell (service shows as Running)
Manually creating WinNAT rule: New-NetNat -Name "cowork-vm-nat" -InternalIPInterfaceAddressPrefix "172.16.0.0/24" (created successfully, Active: True)
Disabling Kaspersky antivirus entirely
Cleaning residual files from %APPDATA%\Claude, %LOCALAPPDATA%\Claude
Deleting CoworkVMService from registry and reinstalling

Diagnostic output:
powershellPS> Get-Service vmms
Status: Running

PS> Get-Service CoworkVMService
Status: Running

PS> hcsdiag list
(empty — no VM running)

PS> Get-HnsNetwork | Format-List Name, Id, Subnets
Name: Default Switch only (no cowork-vm-nat network)
Logs show repeated TypeError: Failed to fetch against assets-proxy.anthropic.com and api.anthropic.com, plus [MCP Registry] fetch failed with diagnostics.
Impact: 3+ working days of lost productivity. I run a digital marketing agency and rely on Cowork and Claude Code daily. I am paying $100/month for what is currently a $20 Chat-only experience.
Expected behavior: Cowork workspace starts, Connectors load, Claude Code authenticates — as they did before the update.
Related issues: #24918, #25136, #27801, #42591, #27010

What Should Happen?

Cowork workspace should start successfully, Connectors Directory should load, and Claude Code should authenticate — as they all did before the latest auto-update.

Error Messages/Logs

Error 1 — Cowork:
Failed to start Claude's workspace
Request error: net::ERR_CONNECTION_RESET
Sometimes alternates with net::ERR_CONNECTION_ABORTED.
Error 2 — Connectors:
Could not load connectors directory
Could not attach to MCP server Kapture Browser Automation
Error 3 — Claude Code (in Desktop):
Error invoking remote method '$eipc_message$_45a8c035-be9c-4c52-b315-81a10e384931_$_claude.web_$_LocalSessions_$_start':
OAuthError: Unable to start session. Check your internet connection and try again.

Steps to Reproduce

1. Have a working Claude Desktop installation on Windows 11 Pro with Cowork, Connectors, and Claude Code all functioning normally
2. Receive the latest Claude Desktop auto-update
3. Open Claude Desktop → switch to Cowork tab
4. Observe: "Failed to start Claude's workspace — Request error: net::ERR_CONNECTION_RESET"
5. Observe: "Could not load connectors directory" banner
6. Open Claude Code in Desktop → Observe: "OAuthError: Unable to start session"
7. Regular Chat mode works perfectly — only premium features are broken

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

N/A — using Claude Code through Desktop app, CLI not installed

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_