For further analysis, I recommend to attach strace -tt /root/dhcpd.strace $(pidof dhcpd) to the running server.
Dec 17 15:29:47 littleboy dhcpd: Cannot search for (&(objectClass=dhcpHost)(dhcpHWAddress=ethernet 00:d0:b7:c1:15:84)) in LDAP tree cn=morrison-primary,ou=Configs,ou=ISCdhcpDaemon,ou=SubSystems,o=Morrison Industries,c=US: Can't contact LDAP server nohup strace -tt -o /root/dhcpd.strace -p 20296 & 15:28:36.492118 gettimeofday({1103315316, 492180}, NULL) = 0 15:28:36.492239 select(10, [4 7 8 9], [], [], {14531, 507820}) = 1 (in [4], left {14525, 617000}) 15:28:42.383155 gettimeofday({1103315322, 383274}, NULL) = 0 15:28:42.383356 recvfrom(4, "E\0\0008\331=\0\0\377\1_\32\300\250\1\23 \300\250\1\t\5"..., 1500, 0, {sa_family=AF_INET, sin_port=htons(32961), sin_addr=inet_addr("192.168.1.19")}, [16]) = 56 15:28:42.383626 gettimeofday({1103315322, 383688}, NULL) = 0 15:28:42.383764 select(10, [4 7 8 9], [], [], {14525, 616312}) = 1 (in [4], left {14525, 39000}) 15:28:42.962272 gettimeofday({1103315322, 962399}, NULL) = 0 15:28:42.962476 recvfrom(4, "E\0\0008\331?\0\0\377\1_\30\300\250\1\23 \300\250\1\t\5"..., 1500, 0, {sa_family=AF_INET, sin_port=htons(32961), sin_addr=inet_addr("192.168.1.19")}, [16]) = 56 15:28:42.962760 gettimeofday({1103315322, 962827}, NULL) = 0 15:28:42.962885 select(10, [4 7 8 9], [], [], {14525, 37173}) = 1 (in [4], left {14524, 364000}) 15:28:43.637871 gettimeofday({1103315323, 637991}, NULL) = 0 15:28:43.638068 recvfrom(4, "E\0\0008\331A\0\0\377\1_\26\300\250\1\23 \300\250\1\t\5"..., 1500, 0, {sa_family=AF_INET, sin_port=htons(32961), sin_addr=inet_addr("192.168.1.19")}, [16]) = 56 15:28:43.638345 gettimeofday({1103315323, 638408}, NULL) = 0 15:28:43.638466 select(10, [4 7 8 9], [], [], {14524, 361592}) = 1 (in [4], left {14523, 708000}) 15:28:44.293475 gettimeofday({1103315324, 293599}, NULL) = 0 15:28:44.293676 recvfrom(4, "E\0\0008\331E\0\0\377\1_\22\300\250\1\23 \300\250\1\t\5"..., 1500, 0, {sa_family=AF_INET, sin_port=htons(32961), sin_addr=inet_addr("192.168.1.19")}, [16]) = 56 15:28:44.293965 gettimeofday({1103315324, 294029}, NULL) = 0 15:28:44.294509 select(10, [4 7 8 9], [], [], {14523, 705971}) = 1 (in [4], left {14522, 499000}) 15:28:45.503263 gettimeofday({1103315325, 503407}, NULL) = 0 15:28:45.503487 recvfrom(4, "E\0\0008\331I\0\0\377\1_\16\300\250\1\23 \300\250\1\t\5"..., 1500, 0, {sa_family=AF_INET, sin_port=htons(32961), sin_addr=inet_addr("192.168.1.19")}, [16]) = 56 15:28:45.503831 gettimeofday({1103315325, 503902}, NULL) = 0 15:28:45.503962 select(10, [4 7 8 9], [], [], {14522, 496098}) = 1 (in [4], left {14501, 488000}) 15:29:06.513786 gettimeofday({1103315346, 513902}, NULL) = 0 15:29:06.513979 recvfrom(4, "E\0\0008\331\226\0\0\377\1^\301\300\250\1 \23\300\250\1"..., 1500, 0, {sa_family=AF_INET, sin_port=htons(32961), sin_addr=inet_addr("192.168.1.19")}, [16]) = 56 15:29:06.514264 gettimeofday({1103315346, 514328}, NULL) = 0 15:29:06.514386 select(10, [4 7 8 9], [], [], {14501, 485672}) = 1 (in [4], left {14494, 760000}) 15:29:13.241537 gettimeofday({1103315353, 241655}, NULL) = 0 15:29:13.241732 recvfrom(4, "E\0\0008\331\264\0\0\377\1^\243\300\250\1 \23\300\250\1"..., 1500, 0, {sa_family=AF_INET, sin_port=htons(32961), sin_addr=inet_addr("192.168.1.19")}, [16]) = 56 15:29:13.242001 gettimeofday({1103315353, 242064}, NULL) = 0 15:29:13.242121 select(10, [4 7 8 9], [], [], {14494, 757936}) = 1 (in [4], left {14494, 59000}) 15:29:13.941815 gettimeofday({1103315353, 941933}, NULL) = 0 15:29:13.942010 recvfrom(4, "E\0\0008\331\267\0\0\377\1^\240\300\250\1 \23\300\250\1"..., 1500, 0, {sa_family=AF_INET, sin_port=htons(32961), sin_addr=inet_addr("192.168.1.19")}, [16]) = 56 15:29:13.942298 gettimeofday({1103315353, 942365}, NULL) = 0 15:29:13.942423 select(10, [4 7 8 9], [], [], {14494, 57635}) = 1 (in [4], left {14490, 54000}) 15:29:17.947485 gettimeofday({1103315357, 947603}, NULL) = 0 15:29:17.947680 recvfrom(4, "E\0\0008\331\311\0\0\377\1^\216\300\250\1 \23\300\250\1"..., 1500, 0, {sa_family=AF_INET, sin_port=htons(32961), sin_addr=inet_addr("192.168.1.19")}, [16]) = 56 15:29:17.947959 gettimeofday({1103315357, 948022}, NULL) = 0 15:29:17.948080 select(10, [4 7 8 9], [], [], {14490, 51978}) = 1 (in [4], left {14489, 460000}) 15:29:18.545015 gettimeofday({1103315358, 545140}, NULL) = 0 15:29:18.545218 recvfrom(4, "E\0\0008\331\314\0\0\377\1^\213\300\250\1 \23\300\250\1"..., 1500, 0, {sa_family=AF_INET, sin_port=htons(32961), sin_addr=inet_addr("192.168.1.19")}, [16]) = 56 15:29:18.545504 gettimeofday({1103315358, 545567}, NULL) = 0 15:29:18.545625 select(10, [4 7 8 9], [], [], {14489, 454433}) = 1 (in [4], left {14487, 925000}) 15:29:20.075972 gettimeofday({1103315360, 76092}, NULL) = 0 15:29:20.076169 recvfrom(4, "E\0\0008\331\322\0\0\377\1^\205\300\250\1 \23\300\250\1"..., 1500, 0, {sa_family=AF_INET, sin_port=htons(32961), sin_addr=inet_addr("192.168.1.19")}, [16]) = 56 15:29:20.076458 gettimeofday({1103315360, 76520}, NULL) = 0 15:29:20.076578 select(10, [4 7 8 9], [], [], {14487, 923480}) = 1 (in [4], left {14487, 291000}) 15:29:20.709787 gettimeofday({1103315360, 709905}, NULL) = 0 15:29:20.709982 recvfrom(4, "E\0\0008\331\325\0\0\377\1^\202\300\250\1 \23\300\250\1"..., 1500, 0, {sa_family=AF_INET, sin_port=htons(32961), sin_addr=inet_addr("192.168.1.19")}, [16]) = 56 15:29:20.710250 gettimeofday({1103315360, 710312}, NULL) = 0 15:29:20.710370 select(10, [4 7 8 9], [], [], {14487, 289688}) = 1 (in [4], left {14485, 762000}) 15:29:22.239269 gettimeofday({1103315362, 239390}, NULL) = 0 15:29:22.239480 recvfrom(4, "E\0\0008\331\335\0\0\377\1^z\300\250\1\23 \300\250\1\t\5"..., 1500, 0, {sa_family=AF_INET, sin_port=htons(32961), sin_addr=inet_addr("192.168.1.19")}, [16]) = 56 15:29:22.239763 gettimeofday({1103315362, 239826}, NULL) = 0 15:29:22.239883 select(10, [4 7 8 9], [], [], {14485, 760174}) = 1 (in [4], left {14475, 368000}) 15:29:32.633504 gettimeofday({1103315372, 633628}, NULL) = 0 15:29:32.633722 recvfrom(4, "E\0\0008\332\4\0\0\377\1^S\300\250\1\23\300 \250\1\t\5\0"..., 1500, 0, {sa_family=AF_INET, sin_port=htons(32961), sin_addr=inet_addr("192.168.1.19")}, [16]) = 56 15:29:32.634002 gettimeofday({1103315372, 634065}, NULL) = 0 15:29:32.634123 select(10, [4 7 8 9], [], [], {14475, 365935}) = 1 (in [4], left {14474, 338000}) 15:29:33.662708 gettimeofday({1103315373, 662834}, NULL) = 0 15:29:33.662911 recvfrom(4, "E\0\0008\332\7\0\0\377\1^P\300\250\1\23\300 \250\1\t\5\0"..., 1500, 0, {sa_family=AF_INET, sin_port=htons(32961), sin_addr=inet_addr("192.168.1.19")}, [16]) = 56 15:29:33.663241 gettimeofday({1103315373, 663304}, NULL) = 0 15:29:33.663363 select(10, [4 7 8 9], [], [], {14474, 336696}) = 1 (in [4], left {14463, 153000}) 15:29:44.849121 gettimeofday({1103315384, 849240}, NULL) = 0 15:29:44.849317 recvfrom(4, "E\0\0008\332-\0\0\377\1^*\300\250\1\23\300 \250\1\t\5\0"..., 1500, 0, {sa_family=AF_INET, sin_port=htons(32961), sin_addr=inet_addr("192.168.1.19")}, [16]) = 56 15:29:44.849587 gettimeofday({1103315384, 849650}, NULL) = 0 15:29:44.849707 select(10, [4 7 8 9], [], [], {14463, 150350}) = 1 (in [8], left {14460, 111000}) 15:29:47.890814 gettimeofday({1103315387, 890947}, NULL) = 0 15:29:47.891030 recvfrom(8, "\1\1\6\1\32\34\337~\0\0\0\0\0\0\0\0\0\0\0\0 \0\0\0\0\300"..., 4096, 0, {sa_family=AF_INET, sin_port=htons(67), sin_addr=inet_addr("192.168.10.19")}, [16]) = 303 15:29:47.891444 time(NULL) = 1103315387 15:29:47.891575 write(5, "0\201\271\2\1\34c\201\263 \4Xcn=morrison-primary,o"..., 188) = 188 15:29:47.891887 select(1024, [5], [], NULL, NULL) = 1 (in [5]) 15:29:47.892311 read(5, "", 8) = 0 15:29:47.892493 time([1103315387]) = 1103315387 15:29:47.892637 open("/etc/localtime", O_RDONLY) = 0 15:29:47.892802 fstat64(0, {st_mode=S_IFREG|0644, st_size=811, ...}) = 0 15:29:47.892996 close(0) = 0 15:29:47.893133 open("/etc/localtime", O_RDONLY) = 0 15:29:47.893263 fstat64(0, {st_mode=S_IFREG|0644, st_size=811, ...}) = 0 15:29:47.893474 close(0) = 0 15:29:47.893622 open("/etc/localtime", O_RDONLY) = 0 15:29:47.893762 fstat64(0, {st_mode=S_IFREG|0644, st_size=811, ...}) = 0 15:29:47.894011 close(0) = 0 15:29:47.894137 rt_sigaction(SIGPIPE, {0x401155c0, [], 0}, {SIG_DFL}, 8) = 0 15:29:47.894320 send(3, "<27>Dec 17 15:29:47 dhcpd: Canno"..., 241, 0) = 241 15:29:47.894699 rt_sigaction(SIGPIPE, {SIG_DFL}, NULL, 8) = 0 15:29:47.894897 write(5, "0\5\2\1\35B\0", 7) = -1 EPIPE (Broken pipe) 15:29:47.895090 --- SIGPIPE (Broken pipe) @ 0 (0) ---