After installing the Oracle Real Application Clusters (Oracle RAC), you must add executable files to the Windows Firewall exception list.
For the Oracle RAC database, the executable file that require exceptions are:
Oracle_home\bin\oracle.exe - Oracle RAC database instance
Oracle_home\bin\emagent.exe - Oracle Enterprise Manager agent
Oracle_home\jdk\bin\java.exe - For the Oracle Enterprise Manager Database Console
In addition, the following ports should be added to the Windows Firewall exception list:
Microsoft file sharing system management bus (SMB)
TCP ports from 135 through 139
Direct-hosted SMB traffic without a network basic I/O system (NetBIOS)
port 445 (TCP)