Hi I’m using freeradius 2.1.12 with external program calling for auth, pre-auth and acct A while after radius up, it reports: Sat Nov 26 13:02:03 2011 : Error: Couldn't fork /etc/netbill/acct.pl: Cannot allocate memory The machine is: 12 G ram, CentOS 5.4, Kernel 2.6.18-164.el5PAE 32 bits Vmstat shows at least 6.8G FREE: procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ r b swpd free buff cache si so bi bo in cs us sy id wa st 1 0 0 6864832 17424 553392 0 0 0 0 3707 7184 1 2 98 0 0 0 0 0 6863840 17424 553880 0 0 0 164 4532 8138 0 2 98 0 0 0 0 0 6863592 17432 554356 0 0 0 2192 4106 6809 0 1 98 0 0 And /proc/meminfo: -bash-3.1# cat /proc/meminfo MemTotal: 12464608 kB MemFree: 6945096 kB Buffers: 16732 kB Cached: 486116 kB SwapCached: 0 kB Active: 3929056 kB Inactive: 58056 kB HighTotal: 11655356 kB HighFree: 6889628 kB LowTotal: 809252 kB LowFree: 55468 kB SwapTotal: 2008116 kB SwapFree: 2008116 kB Dirty: 259036 kB Writeback: 0 kB AnonPages: 3484324 kB Mapped: 12016 kB Slab: 653076 kB PageTables: 773364 kB NFS_Unstable: 0 kB Bounce: 0 kB CommitLimit: 11979800 kB Committed_AS: 11642520 kB VmallocTotal: 116728 kB VmallocUsed: 9040 kB VmallocChunk: 107296 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 Hugepagesize: 2048 kB Raduisd.conf: Max_servers=32 Min_start_servers=32 min_spare_servers = 0 max_spare_servers = 32