sfront2-053.yandex.ru - это робот??

| ::1 - - [05/May/2007:00:07:01 +0000] "GET / HTTP/1.0" 200 16153 "-" "Apache/2.2.3 (FreeBSD) mod_ssl/2.2.3 OpenSSL/0.9.7e-p1 DAV/2 PHP/5.2.0 with Suhosin-Patch (internal dummy connection)"

It's defined in /server/mpm_common.c:

| This function connects to the server, then immediately closes the
| connection.
| This permits the MPM to skip the poll when there is only one listening
| socket, because it provides a alternate way to unblock an accept()
| when the pod is used.

pod=pipe of death.

| The pipe of death is used to tell all child processes that it is time
| to die gracefully.

So if you use the worker MPM which doesn't use a pod, there are no
internal dummy connections anymore.