Unwanted SQL Developer inverse connection storming

recently we noticed that the Oracle SQL Developer causes a kind of unwanted "inverse" connection storm to all configured databases, when we start the SQL Developer. It's not restoring aborted connections or stuff like that, all was quit before stopping the SQL dev., and nevertheless each and every configured connection is "tested" at startup.

In my example, it's doing the following for all configured connections
(tested with version 3.2.20.09):

TNS connect:
(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=ww.xx.yy.zz)(PORT=1521))(CONNECT_DATA=(CID=(PROGRAM=null)(HOST=__jdbc__)(USER=null))(SERVICE_NAME=xyz)(CID=(PROGRAM=null)(HOST=__jdbc__)(USER=null))))
and gets back:
(DESCRIPTION=(TMP=)(VSNNUM=186647296)(ERR=12514)(ERROR_STACK=(ERROR=(CODE=12514)(EMFI=4))))
I'm having multiple problems with this behavior: 1.) it's useless, since the SQL dev does not display any information about reachable/non-reachable databases. I simply can't see any benefit. 2.) it's waste of network resources
2.) it's most unwanted since your network can see what you have configured (for example in a public WLAN, and in worst case a IDS might feel like you are doing something nasty in the (for example, customer's) network)

Does somebody know why they are doing this, and why are they doing it THIS very way?

Thanks a lot in advance and best regards Martin Klier

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