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dcs.MTProxy expects raw secret bytes. Carrying them verbatim through a YAML string field is impossible: real secrets contain bytes >= 0x80 (faketls starts with 0xee, secured with 0xdd) which cannot survive a unicode string round-trip, so the value reached the bridge corrupted or empty (gotd then logged "invalid secret"). Accept the standard hex form printed by mtg/MTProxy tooling (e.g. "ee" + 16-byte secret + cloak domain hex) and decode it before handing the bytes to gotd. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>