/var/log/apache/error_log on debug loglevel (normal start): [Mon Feb 11 13:08:31 2013] [notice] caught SIGTERM, shutting down [Mon Feb 11 13:08:31 2013] [info] Init: Seeding PRNG with 144 bytes of entropy [Mon Feb 11 13:08:31 2013] [info] Init: Generating temporary RSA private keys (512/1024 bits) [Mon Feb 11 13:08:31 2013] [info] Init: Generating temporary DH parameters (512/1024 bits) [Mon Feb 11 13:08:31 2013] [info] Init: Initializing (virtual) servers for SSL [Mon Feb 11 13:08:31 2013] [info] mod_ssl/2.2.23 compiled against Server: Apache/2.2.23, Library: OpenSSL/1.0.1c [Mon Feb 11 13:08:31 2013] [info] mod_unique_id: using ip addr 192.168.1.1 [Mon Feb 11 13:08:32 2013] [info] Init: Seeding PRNG with 144 bytes of entropy [Mon Feb 11 13:08:32 2013] [info] Init: Generating temporary RSA private keys (512/1024 bits) [Mon Feb 11 13:08:32 2013] [info] Init: Generating temporary DH parameters (512/1024 bits) [Mon Feb 11 13:08:32 2013] [debug] ssl_scache_shmcb.c(253): shmcb_init allocated 512000 bytes of shared memory [Mon Feb 11 13:08:32 2013] [debug] ssl_scache_shmcb.c(272): for 511920 bytes (512000 including header), recommending 32 subcaches, 133 indexes each [Mon Feb 11 13:08:32 2013] [debug] ssl_scache_shmcb.c(306): shmcb_init_memory choices follow [Mon Feb 11 13:08:32 2013] [debug] ssl_scache_shmcb.c(308): subcache_num = 32 [Mon Feb 11 13:08:32 2013] [debug] ssl_scache_shmcb.c(310): subcache_size = 15992 [Mon Feb 11 13:08:32 2013] [debug] ssl_scache_shmcb.c(312): subcache_data_offset = 3208 [Mon Feb 11 13:08:32 2013] [debug] ssl_scache_shmcb.c(314): subcache_data_size = 12784 [Mon Feb 11 13:08:32 2013] [debug] ssl_scache_shmcb.c(316): index_num = 133 [Mon Feb 11 13:08:32 2013] [info] Shared memory session cache initialised [Mon Feb 11 13:08:32 2013] [info] Init: Initializing (virtual) servers for SSL [Mon Feb 11 13:08:32 2013] [info] mod_ssl/2.2.23 compiled against Server: Apache/2.2.23, Library: OpenSSL/1.0.1c [Mon Feb 11 13:08:32 2013] [info] mod_unique_id: using ip addr 192.168.1.1 [Mon Feb 11 13:08:33 2013] [notice] Apache/2.2.23 (Unix) mod_ssl/2.2.23 OpenSSL/1.0.1c PHP/5.4.8--pl0-gentoo configured -- resuming normal operations [Mon Feb 11 13:08:33 2013] [info] Server built: Feb 8 2013 10:05:00 [Mon Feb 11 13:08:33 2013] [debug] prefork.c(1023): AcceptMutex: sysvsem (default: sysvsem) # vim /etc/apache2/vhosts.d/00_default_vhost.conf (now change Listen directory value from Listen 80 to Listen 192.168.1.1:80) # cat /var/run/apache2.pid 19605 # kill -HUP 19605 # /etc/init.d/apache2 status * status: crashed Event in log: [Mon Feb 11 13:10:31 2013] [notice] SIGHUP received. Attempting to restart (98)Address already in use: make_sock: could not bind to address 192.168.1.1:80 no listening sockets available, shutting down Unable to open logs # /etc/init.d/apache2 restart * Stopping apache2 ... httpd (pid 19605?) not running [ ok ] * Starting apache2 ... [ ok ] /var/log/apache/error_log on debug loglevel (start after crash): [Mon Feb 11 13:11:44 2013] [info] Init: Seeding PRNG with 144 bytes of entropy [Mon Feb 11 13:11:44 2013] [info] Init: Generating temporary RSA private keys (512/1024 bits) [Mon Feb 11 13:11:45 2013] [info] Init: Generating temporary DH parameters (512/1024 bits) [Mon Feb 11 13:11:45 2013] [info] Init: Initializing (virtual) servers for SSL [Mon Feb 11 13:11:45 2013] [info] mod_ssl/2.2.23 compiled against Server: Apache/2.2.23, Library: OpenSSL/1.0.1c [Mon Feb 11 13:11:45 2013] [info] mod_unique_id: using ip addr 192.168.1.1 [Mon Feb 11 13:11:46 2013] [info] Init: Seeding PRNG with 144 bytes of entropy [Mon Feb 11 13:11:46 2013] [info] Init: Generating temporary RSA private keys (512/1024 bits) [Mon Feb 11 13:11:46 2013] [info] Init: Generating temporary DH parameters (512/1024 bits) [Mon Feb 11 13:11:46 2013] [debug] ssl_scache_shmcb.c(253): shmcb_init allocated 512000 bytes of shared memory [Mon Feb 11 13:11:46 2013] [debug] ssl_scache_shmcb.c(272): for 511920 bytes (512000 including header), recommending 32 subcaches, 133 indexes each [Mon Feb 11 13:11:46 2013] [debug] ssl_scache_shmcb.c(306): shmcb_init_memory choices follow [Mon Feb 11 13:11:46 2013] [debug] ssl_scache_shmcb.c(308): subcache_num = 32 [Mon Feb 11 13:11:46 2013] [debug] ssl_scache_shmcb.c(310): subcache_size = 15992 [Mon Feb 11 13:11:46 2013] [debug] ssl_scache_shmcb.c(312): subcache_data_offset = 3208 [Mon Feb 11 13:11:46 2013] [debug] ssl_scache_shmcb.c(314): subcache_data_size = 12784 [Mon Feb 11 13:11:46 2013] [debug] ssl_scache_shmcb.c(316): index_num = 133 [Mon Feb 11 13:11:46 2013] [info] Shared memory session cache initialised [Mon Feb 11 13:11:46 2013] [info] Init: Initializing (virtual) servers for SSL [Mon Feb 11 13:11:46 2013] [info] mod_ssl/2.2.23 compiled against Server: Apache/2.2.23, Library: OpenSSL/1.0.1c [Mon Feb 11 13:11:46 2013] [info] mod_unique_id: using ip addr 192.168.1.1 [Mon Feb 11 13:11:47 2013] [warn] pid file /var/run/apache2.pid overwritten -- Unclean shutdown of previous Apache run? [Mon Feb 11 13:11:47 2013] [notice] Apache/2.2.23 (Unix) mod_ssl/2.2.23 OpenSSL/1.0.1c PHP/5.4.8--pl0-gentoo configured -- resuming normal operations [Mon Feb 11 13:11:47 2013] [info] Server built: Feb 8 2013 10:05:00 [Mon Feb 11 13:11:47 2013] [debug] prefork.c(1023): AcceptMutex: sysvsem (default: sysvsem) Received later (Listen directory in config is unchanged) HUP signals are hanled correctly, as expected. Checked on www-servers/apache-2.2.23 on Gentoo GNU/Linux, but issue also seems to be reproducable on FreeBSD (at least 7.x branch).
I've forgot, to tell, that restart using init script (i.e. /etc/init.d/apache2 restart) works fine both on first and latest restarts of daemon.