Add this to your code 
die sprintf "ERRRR(%d)(%s)(%d)(%s)", $!,$!,$^E,$^E;

[download]
that should give you better idea of exact error (LWP should include this)

In reply to Re^6: LWP for URL monitoring - 500 connect timeout errors by Anonymous Monk
in thread LWP for URL monitoring - 500 connect timeout errors by oalvi

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