Wake on Lan issue

Guys, I need your help to understand what is happening.
The story goes like this, I've been waking up my vicidial server from my IPCop firewall without any problem since 2 or 3 weeks ago; however it have happened twice that 2 minutes after sending the packet to wake it up I can access the admin.php but asterisk is still down and because of that softphones cannot get registered.
I've ran asterisk manually through a ssh session.
My stuff is
OpenSuse at server
Asterisk 1.4.21.2
VERSION: 2.2.0-215
BUILD: 90908-1207
thanks
The story goes like this, I've been waking up my vicidial server from my IPCop firewall without any problem since 2 or 3 weeks ago; however it have happened twice that 2 minutes after sending the packet to wake it up I can access the admin.php but asterisk is still down and because of that softphones cannot get registered.
I've ran asterisk manually through a ssh session.
My stuff is
OpenSuse at server
Asterisk 1.4.21.2
VERSION: 2.2.0-215
BUILD: 90908-1207
thanks