sideband connect command crashes but no logs

Try this:

if {[catch {connect -timeout 10000 -idle 30 -status conn_status 10.10.10.10:8080} conn] || $conn eq ""} {log local0. "Connection could not be established to sideband_virtual_server" } else {log local0. "Connect returns: $conn and conn status: $conn_status"}

I edited my post to increase the timeout from 1000 milliseconds to 10000 milliseconds.