Hi. Was out of action for a few days owing to sickness. Thanks for the tips. I smacked by forehead for not setting up warnings. ( I thought I had ) I do not know what happened after that. I was so fed up of the daemon dying that I just decided to look into the most tricky part. Consider this code which is part of one of the spawned threads

    iprint " MAC: $mac : Contacting  API......\n" if $debug > 1;
    # Wrap call to API with eval
    eval {
          local $SIG{ALRM} = sub { iprint "Network Delay) 
          alarm ( $maxNetworkDelay) ; 
          $ua = LWP::UserAgent->new( timeout => $maxNetworkDelay);
          $response = $ua->request( HTTP::Request->new(GET => $AuthURL
+forMAC.$mac));
          $respcon = $response->content;
          alarm(0);
    };
    iprint " MAC: $mac $@" if $@;
[download]

( I know you had mentioned earlier that LWP::Simple would do the job but then I needed to look specifically into the RC codes in the response which LWP::Simple does not support.) 2 threads use the above code for 2 different URLS and the response is looked into for further course of action

I initially thought that the ALRM signal would be trapped in the eval block and the local signal handler would do the job. Apparently, the $maxNetworkDelay was being triggered when network delays occurs and that actually sends a signal to all threads. This was causing the death of the daemon.

By simply adding a $SIG{ALRM} = sub { return;) at the very top of the daemon before any thread definition I was able to recover. So when the ALRM is triggered all threads receieve them and return back to the state they were in earlier. MOdified code below with $SIG{ALRM} handler defined as common for all threads and local handler removed.

    iprint " MAC: $mac : Contacting  API......\n" if $debug > 1;
    # Wrap call to API with eval
    eval {

          $ua = LWP::UserAgent->new( timeout => $maxNetworkDelay);
          $response = $ua->request( HTTP::Request->new(GET => $AuthURL
+forMAC.$mac));
          $respcon = $response->content;

    };
    iprint " MAC: $mac $@" if $@;
[download]

For the first time the daemon has run for 2 days without a problem. Did I know why I wrote the handler at the top? Partly yes, because I knew all threads were getting the signals in 5.8.4.

Do I know what is happening precisely? Definately not. Would appreciate your views on this