Add a note for the removal of default MPTCP enablement in the migration guide

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Romain 2025-07-23 12:04:04 +02:00 committed by GitHub
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@ -319,3 +319,14 @@ and Traefik now keeps them encoded to avoid any ambiguity.
| `/foo/../bar` | PathPrefix(`/bar`) | Match | Match |
| `/foo/%2E%2E/bar` | PathPrefix(`/foo`) | Match | No match |
| `/foo/%2E%2E/bar` | PathPrefix(`/bar`) | No match | Match |
## v3.4.5
### MultiPath TCP
Since `v3.4.5`, the MultiPath TCP support introduced with `v3.4.2` has been removed.
It appears that enabling MPTCP on some platforms can cause Traefik to stop with the following error logs message:
- `set tcp X.X.X.X:X->X.X.X.X:X: setsockopt: operation not supported`
However, it can be re-enabled by setting the `multipathtcp` variable in the GODEBUG environment variable, see the related [go documentation](https://go.dev/doc/godebug#go-124).