SYSTEM WARNING: 'date_default_timezone_get(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone.' in '/usr/share/mantis/www/core.php' line 264

0001688: kernel: nf_ct_ras: decoding error: out of range - MantisBT
MantisBT - Endian Firewall
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0001688Endian FirewallHardware related (kernel, drivers, hardware)public2009-03-18 15:482010-09-21 10:47
noneminorunable to reproduce
0001688: kernel: nf_ct_ras: decoding error: out of range
The message in summary appears sometimes in /var/log/messages

It seems an harmless messages related to netfilter nf_conntrack_h323 module.
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Issue History
2009-03-18 15:48luca-endianNew Issue
2009-03-18 15:49luca-endianDescription Updated
2010-09-21 10:47peter-endianNote Added: 0004779
2010-09-21 10:47peter-endianStatusnew => feedback

2010-09-21 10:47   
most probably there passed a packet which was not h323 which perhaps the module recognized as related to the h323 stream due to accidental same ports or something like that.
it's however a warning

does it cause havoc?