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remote connection times out from AWS , from local remote connects

in Database Administration (MOSC) 2 comments

we are trying to connect from a SA database in AWS to a rac database in our local RAC servers with two

instances ; one succeeds, one gets to timeout .

when connecting from a local database both instances connect .

all requisites are ok, nslookup ,ping , telnet with port 1521, tnsping .

in AWS in SG the outbound rules are open and 1521 is open everywhere, so the network and everything on the way is open.

the RAC is v11.2.0.4 , the SA in AWS 19.10 ( including opatches).

This is really strange and any advice will be appreciated.

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