Hi all, One of our CentOS 5.3 randomly reboots, at different times of the day, and I can't see why it's doing it. I have looked through the logs, but don't see any thing in there that shows me why it has rebooted. How can I debug this? Here's a snipped from the log, around the time of the reboot: Jun 2 14:59:59 usaxen02 kernel: EXT3-fs: mounted filesystem with ordered data mode. Jun 2 15:00:06 usaxen02 kernel: kjournald starting. Commit interval 5 seconds Jun 2 15:00:06 usaxen02 kernel: EXT3 FS on dm-8, internal journal Jun 2 15:00:06 usaxen02 kernel: EXT3-fs: mounted filesystem with ordered data mode. Jun 2 15:00:39 usaxen02 kernel: device vifvenu0 entered promiscuous mode Jun 2 15:00:39 usaxen02 kernel: ADDRCONF(NETDEV_UP): vifvenu0: link is not ready Jun 2 21:00:39 usaxen02 logger: /etc/xen/scripts/vif-bridge: iptables -A FORWARD -m physdev --physdev-in vifvenu0 -s 72.9.241.226 72.9.241.227 72.9.2 41.232 72.9.247.207 -j ACCEPT failed. If you are using iptables, this may affect networking for guest domains. Jun 2 15:00:43 usaxen02 kernel: blkback: ring-ref 8, event-channel 6, protocol 1 (x86_64-abi) Jun 2 15:00:43 usaxen02 kernel: blkback: ring-ref 9, event-channel 7, protocol 1 (x86_64-abi) Jun 2 15:00:43 usaxen02 kernel: ADDRCONF(NETDEV_CHANGE): vifvenu0: link becomes ready Jun 2 15:00:43 usaxen02 kernel: xenbr1: topology change detected, propagating Jun 2 15:00:43 usaxen02 kernel: xenbr1: port 5(vifvenu0) entering forwarding state Jun 2 17:30:22 usaxen02 syslogd 1.4.1: restart. Jun 2 17:30:22 usaxen02 kernel: klogd 1.4.1, log source = /proc/kmsg started. Jun 2 17:30:22 usaxen02 kernel: Bootdata ok (command line is ro root=/dev/VolGroup00/LogVol01 ide0=noprobe) Jun 2 17:30:22 usaxen02 kernel: Linux version 2.6.18-128.1.10.el5xen (mockbuild at builder10.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-44)) #1 SMP Thu May 7 11:07:18 EDT 2009 Jun 2 17:30:22 usaxen02 kernel: BIOS-provided physical RAM map: Jun 2 17:30:22 usaxen02 kernel: Xen: 0000000000000000 - 00000001de804000 (usable) Jun 2 17:30:22 usaxen02 kernel: DMI 2.4 present. Jun 2 17:30:22 usaxen02 kernel: ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled) Jun 2 17:30:22 usaxen02 kernel: ACPI: LAPIC (acpi_id[0x03] lapic_id[0x02] enabled) Jun 2 17:30:22 usaxen02 kernel: ACPI: LAPIC (acpi_id[0x02] lapic_id[0x01] enabled) Jun 2 17:30:22 usaxen02 kernel: ACPI: LAPIC (acpi_id[0x04] lapic_id[0x03] enabled) Jun 2 17:30:22 usaxen02 kernel: ACPI: LAPIC_NMI (acpi_id[0x01] dfl dfl lint[0x1]) Jun 2 17:30:22 usaxen02 kernel: ACPI: LAPIC_NMI (acpi_id[0x02] dfl dfl lint[0x1]) Jun 2 17:30:22 usaxen02 kernel: ACPI: IOAPIC (id[0x02] address[0xfec00000] gsi_base[0]) Jun 2 17:30:22 usaxen02 kernel: IOAPIC[0]: apic_id 2, version 32, address 0xfec00000, GSI 0-23 Jun 2 17:30:22 usaxen02 kernel: ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl) Jun 2 17:30:22 usaxen02 kernel: ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level) Jun 2 17:30:22 usaxen02 kernel: Setting APIC routing to xen Jun 2 17:30:22 usaxen02 kernel: Using ACPI (MADT) for SMP configuration information Jun 2 17:30:22 usaxen02 kernel: Allocating PCI resources starting at d4000000 (gap: d0000000:2ff00000) -- Kind Regards Rudi Ahlers CEO, SoftDux Hosting Web: http://www.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532