While running tests on Windows, the following tests (from network-stream-tests.el) hang up and have to be interrupted:

connect-to-tls-ipv4-wait
open-network-stream-tls-wait
open-network-stream-tls
open-network-stream-tls-nocert
open-gnutls-stream-new-api-default
open-gnutls-stream-new-api-wait
open-gnutls-stream-old-api-wait

In GNU Emacs 27.0.50 (build 1, x86_64-w64-mingw32)
of 2019-09-30 built on ODIEFAST
Repository revision: fd887250dc560541ecc2a3ea4a5d6f61591e2821
Repository branch: master
Windowing system distributor 'Microsoft Corp.', version 10.0.18362
System Description: Microsoft Windows 10 Home (v10.0.1903.18362.356)

Configured using:
'configure --prefix=/d/Devel/emacs/repo/trunk --with-modules
--without-pop --enable-checking=yes
--enable-locallisppath=%emacs_dir%/../site-lisp:%emacs_dir%/share/emacs/@VER@/site-lisp:%emacs_dir%/share/emacs/site-lisp
'CFLAGS=-Og -ggdb3''

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY W32NOTIFY ACL GNUTLS LIBXML2
HARFBUZZ ZLIB TOOLKIT_SCROLL_BARS MODULES THREADS JSON PDUMPER LCMS2 GMP

Important settings:
value of $LANG: ESN
locale-coding-system: cp1252