Oracle SQL Developer 220.127.116.11 is unable to connect to Oracle database over the Cisco VPN tunnel. Connection test displays "Status : Failure - Test failed: IO Error: The Network Adapter could not establish the connection." Trying to connect the message adds Vendor Code 17002
Oracle server is running RAC and database 18.104.22.168. SQL Developer can successfully connect if client is directly on the LAN.
Other things tested on VPN:
TELNET on port 1521 works
TNSPING is successful
Oracle SCAN FQDN is resolving propely via ping and nslookup
Connections used to work fine prior to Oracle RAC reinstall. After new fresh of RAC/Database installation, VPN connections started failing. The same configuration was used as in previous install.
Server OS is Windows 2008 Enterprise R2.
I've researched the issue extensively, I saw similar threads regarding VPN, but no solutions worked.
Solved. Firewall somehow started applying a global policy to VPN connections to filter sqlnet or port 1521 packets.