Bad record MAC while using Stunnel

Good day! I use Syncthing with Stunnel-msspi. This is necessary for channel encryption using Russian algorithms (GOST R 34.10-2001, GOST R 34.10-2012). When the file being forwarded is more than 10-15 MB, the connection fails with the error “tcp-client closed: reading length: local error: tls: bad record MAC”. Is there any way to fix this problem?

That means something corrupted the data Syncthing was receiving. It’s probably an stunnel problem (in that I’ve never seen or heard about that specific error before).

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