See eval: 

my $ssh2 = Net::SSH2->new();
my $res = eval { $ssh2->connect($server)); 1 };
if (my $err = $@) {
    warn "There was an error connecting to $server: $err";
};

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In reply to Re: Net::SSH2 test connection to remote host by Corion
in thread Net::SSH2 test connection to remote host by james_

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