Dear Fajar In fact, I've use radmin before for just few simple task like hup, terminate, stats. Honestly, this is the first time I try 'debug' in radmin! I've took a try few minute ago, it's so convenient and useful! Thank you for let me know this suggestion! Now I think I will try to output some debug log by radmin on our production server to see what's wrong with it when this service is still in low traffic now. At the same time, I will try to copy the context in our test environment to see what's going on. Much appreciate! Btw, do you suggest using large number of perl script in FR? Does it drop performance dramatically? Such as writing some file logs, connect to external UDP server, or some attributes editing in Perl module. Okis