found 41234 28.0.50
thanks

Dmitry Alexandrov <dag@gnui.org> wrote:
> FWIW, strace suggests, that the problematic Emacs process is trying to connect to an outdated nameserver (from a LAN this machine was connected once):

> That is, that /etc/resolv.conf had not been reread...

Heh.  Emacs is able to lost running nscd(8) and fall back to outdated nameserver as well:

        …
	openat(AT_FDCWD, "/etc/hosts", O_RDONLY|O_CLOEXEC) = 7
	lseek(7, 0, SEEK_CUR)                   = 0
	fstat(7, {st_mode=S_IFREG|0644, st_size=184, ...}) = 0
	read(7, "127.0.0.1\tlocalhost\n127.0.1.1\tno"..., 4096) = 184
	lseek(7, 0, SEEK_CUR)                   = 184
	read(7, "", 4096)                       = 0
	close(7)                                = 0
	socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, IPPROTO_IP) = 7
	connect(7, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("192.168.43.245")}, 16) = 0
	gettimeofday({tv_sec=1593704775, tv_usec=183050}, NULL) = 0
	poll([{fd=7, events=POLLOUT}], 1, 0)    = 1 ([{fd=7, revents=POLLOUT}])
	sendto(7, "\254o\1\0\0\1\0\0\0\0\0\0\3gnu\3org\0\0\1\0\1", 25, MSG_NOSIGNAL, NULL, 0) = 25
        …

— thatʼs instead of:

        …
	socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 10
	connect(10, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = 0
	sendto(10, "\2\0\0\0\16\0\0\0\t\0\0\0gnus.org\0", 21, MSG_NOSIGNAL, NULL, 0) = 21
        …

in a freshly started Emacs instance.

Perhaps, I have to try another workaround.