[gnutls-help] cannot to connect to lwn.net with gnutls 3.6.3 on windows 10

[thomas at m3y3r.de]

mhh. debugging with -d 999 shows that the connection fails after writing
the first byte of the client hello:

|<5>| REC[0000000002c7b1c0]: Preparing Packet Handshake(22) with length: 213 and min pad: 0
|<9>| ENC[0000000002c7b1c0]: cipher: NULL, MAC: MAC-NULL, Epoch: 0
|<11>| WRITE: enqueued 218 bytes for 000000000069eaf0. Total 218 bytes.
|<5>| REC[0000000002c7b1c0]: Sent Packet[1] Handshake(22) in epoch 0 and length: 218
|<11>| HWRITE: wrote 1 bytes, 0 bytes left.
|<11>| WRITE FLUSH: 218 bytes in buffer.
|<3>| ASSERT: buffers.c[_gnutls_writev_emu]:464          -> -1 is returned!
|<2>| WRITE: -1 returned from 000000000069eaf0, errno: 0
|<3>| ASSERT: buffers.c[errno_to_gerr]:230
|<11>| WRITE error: code -53, 218 bytes left.    -> ERROR_BAD_NETPATH (?)
|<3>| ASSERT: buffers.c[_gnutls_io_write_flush]:722
|<3>| ASSERT: handshake.c[handshake_client]:2793

what could be the problem here?

any hint is welcome!

with kind regards
thomas