So in QT5.7.0 sources qlocalsocket_win.cpp there are lines:
const QLatin1String pipePath("\\\\.\\pipe\\");
if (d->serverName.startsWith(pipePath))
d->fullServerName = d->serverName;
else
d->fullServerName = pipePath + d->serverName;
So there aren't a chance to connect to a pipe on another PC. I've changed few lines, recompile Qt5Network.dll and all worked fine. Is there any reasons to bound QLocalSocket only to local pipes?