We cannot know what is causing this warning, because we don't know what the subroutines you are calling("health","secureTelnetCommand","pstsqlog") do. The error message sounds like a message from the find utility though, so maybe you are calling that somewhere?

To find your error cause more accurately, insert warnings in between the subroutine calls, like

while ($x != $limit) {        
        foreach $x (@icpList) {
            warn "start loop";
            health($x);
            warn "health executed";
            secureTelnetCommand($x);
            warn "secureTelnetCommand executed";
            pstswlog($x);
            warn "pstswlog executed";
        }
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And take a closer look at the subroutine during which the warning shows up.

Or run the program in the debugger (perl -d script.pl)