I get an UnknownHostException when attempting to get connections after migrating from EAP 4 to EAP 5.1

Issue

• "Caused by" statement in the server.log or console output:

        ....
        Caused by: java.net.UnknownHostException: server1|server2
            at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:177)
            at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
            at java.net.Socket.connect(Socket.java:529)
            at java.net.Socket.connect(Socket.java:478)
            at java.net.Socket.<init>(Socket.java:375)
            at java.net.Socket.<init>(Socket.java:189)
            at com.example.core.PGStream.<init>(PGStream.java:70)
            at com.example.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:115)
            ... 22 more