My matrix-synapse instance has recently stopped federating with @matrix and I'm having a really hard time figuring out why. Nothing has changed in my configuration and the federation testers show that my certs and DNS are valid.

In my logs I can see some 403s occasionally, but not consistently. Any guidance would be greatly appreciated.

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@matrix Actually got this solved, although I'm not totally sure what the issue was.

I had been using an SRV record (which has not been altered in ages) but the addition of a .well-known server:port parameter has fixed federation.

The documentation makes this seem like an either/or thing, so there may be something on my side (or theirs) that's having issues with the SRV record, although I can't figure out why.

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