Tried, and seems I need to boot. Does not work at the first...
of course. what you need is to change the in-kernel default. because each boot starts with them, you must issue sysctl -w ... upon each boot. that's why it's in the rcS script, which is executed when system is booting. of course, if you need instant help w/o reboot, issue the command directly.
shm has nothing to do with tcp/resolver, so this error with connectivity is probably totally unrelated.
regards,
pc