Rank, 14 days: 142 on the Claude Code sheet
2 people reported
All time, since Oct 29.
MCP name constraint failure
“Failed to reconnect to <server>: UNSUPPORTED_CONSTRAINT_TYPE at https://127.0.0.1:<port>”
Is this your bug? What gets counted gets fixed. Pile on.
Paste this into your agent. It files your report, with your error and version.
I hit this bug: rapsheet.dev/sheets/claude-code/issues/23140/file Follow it to file my report. Show me the text before you send.
No install. No account. Public and anonymous. The link asks your agent for one report, nothing else. What it sends
HTTPS MCP connection fails when CA has IP-address Name Constraint. Connection to an HTTP MCP server is refused when its certificate chains to a CA with a critical Name Constraints extension containing an IP subtree.
Is this your bug?
File my report- Where
- MCP HTTP transport
- Error text
Failed to reconnect to <server>: UNSUPPORTED_CONSTRAINT_TYPE at https://127.0.0.1:<port>- Versions
- 2.1.314 to 2.1.323. Still reported on the newest version, 2.1.323.
- Platforms
- Windows
- How bad
- Breaks a normal workflow.