During the upgrade of migrated rules, the ugprade failed with the above error. The complete stack trace is given below.

     [java] Using sun.misc.Perf high-resolution timer for elapsed timings
     [java] Using Java 5 Management beans for thread CPU timings.
     [java] Using Java 5 Management beans for process CPU timings: 3840000000
     [java] 2015-11-20 12:33:34,043 [                main] [          ] [                    ] (.access.PageDatabaseMapperImpl) INFO    - DeflateStreams is turned ON.
     [java] 2015-11-20 12:33:34,105 [                main] [          ] [                    ] (pboard.StorageStreamCommonImpl) INFO    - engineCodeVersion: 07-10-17
     [java] Unable to locate KeyringImpl keyring after trying:
     [java]               <properties>
     [java]               root-pegarules.keyring
     [java]               WHE-304-pegarules.keyring
     [java] 2015-11-20 12:33:35,852 [                main] [          ] [                    ] (l.access.ConnectionManagerImpl) WARN    - The database pegadata is only defined in the bootstrap configuration; create a Data-Admin-DB-Name definition
     [java]               pegarules.keyring
     [java] Nov 20, 2015 12:34:35 PM com.pega.pegarules.internal.bootstrap.PRBootstrap
     [java] SEVERE: Problem during method invocation (main)
     [java] com.pega.pegarules.pub.PRException: A problem occurred.
     [java] From: (unknown)
     [java]               at com.pega.pegarules.deploy.internal.util.ImportImpl.main(ImportImpl.java:398)
     [java]               at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     [java]               at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
     [java]               at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
     [java]               at java.lang.reflect.Method.invoke(Method.java:606)
     [java]               at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethod(PRBootstrap.java:367)
     [java]               at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingThrowable(PRBootstrap.java:408)
     [java]               at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingThrowable(AppServerBridgeToPega.java:223)
     [java]               at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethod(AppServerBridgeToPega.java:272)
     [java]               at com.pega.pegarules.pub.PegaRULES.main(PegaRULES.java:85)
     [java] Caused by: com.pega.pegarules.pub.PRRuntimeException: Error determining the mode of PRPC install from database.
     [java]               at com.pega.pegarules.data.internal.PRDataProviderImpl.isMultiTenantEnvironment(PRDataProviderImpl.java:1135)
     [java]               at com.pega.pegarules.deploy.internal.archive.ParUtilsImpl.setStageDirectory(ParUtilsImpl.java:219)
     [java]               at com.pega.pegarules.deploy.internal.archive.ParUtilsImpl.copyFileToVfsRoot(ParUtilsImpl.java:315)
     [java]               at com.pega.pegarules.deploy.internal.util.ImportImpl.main(ImportImpl.java:261)
     [java]               ... 9 more
     [java] Caused by: com.pega.pegarules.pub.database.ConnectionException: Database-General            Problem encountered when getting connection for database pegarules  17002    08006    IO Error: The Network Adapter could not establish the connection
     [java] From: (unknown)
     [java] Caused by SQL Problems.
     [java] Problem #1, SQLState 08006, Error code 17002: java.sql.SQLRecoverableException: IO Error: The Network Adapter could not establish the connection
     [java]               at com.pega.pegarules.data.internal.access.ExceptionInformation.createExceptionDueToDBFailure(ExceptionInformation.java:256)
     [java]               at com.pega.pegarules.data.internal.access.ConnectionManagerImpl.getConnectionFromDatabaseName(ConnectionManagerImpl.java:856)
     [java]               at com.pega.pegarules.data.internal.access.ConnectionManagerImpl.getConnection(ConnectionManagerImpl.java:1187)
     [java]               at com.pega.pegarules.data.internal.access.ConnectionManagerImpl.getConnection(ConnectionManagerImpl.java:1129)
     [java]               at com.pega.pegarules.data.internal.access.ConnectionManagerImpl.getConnection(ConnectionManagerImpl.java:343)
     [java]               at com.pega.pegarules.data.internal.PRDataProviderImpl.isMultiTenantEnvironment(PRDataProviderImpl.java:1125)
     [java]               ... 12 more

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