diff --git a/src/cas/example/directoryService/directoryServer.cc b/src/cas/example/directoryService/directoryServer.cc
index 9e0437398..4285d9a94 100644
--- a/src/cas/example/directoryService/directoryServer.cc
+++ b/src/cas/example/directoryService/directoryServer.cc
@@ -85,7 +85,7 @@ void directoryServer::installAliasName(const pvInfo &info, const char *pAliasNam
 // directoryServer::pvExistTest()
 //
 pvExistReturn directoryServer::pvExistTest
-	( const casCtx &, const char * pPVName )
+	( const casCtx &, const caNetAddr &, const char * pPVName )
 {
 	//
 	// lifetime of id is shorter than lifetime of pName
diff --git a/src/cas/example/directoryService/directoryServer.h b/src/cas/example/directoryService/directoryServer.h
index 31a7b9348..3bd43012f 100644
--- a/src/cas/example/directoryService/directoryServer.h
+++ b/src/cas/example/directoryService/directoryServer.h
@@ -104,7 +104,8 @@ public:
     directoryServer ( const char * const pvPrefix, unsigned aliasCount );
     ~directoryServer();
     void show ( unsigned level ) const;
-    pvExistReturn pvExistTest ( const casCtx&, const char *pPVName );
+    pvExistReturn pvExistTest ( const casCtx&, 
+        const caNetAddr &, const char *pPVName );
 
     void installAliasName ( const pvInfo &info, const char *pAliasName );
     inline void removeAliasName ( pvEntry &entry );
diff --git a/src/cas/generic/caServer.cc b/src/cas/generic/caServer.cc
index 4b0ba9189..58d5da81b 100644
--- a/src/cas/generic/caServer.cc
+++ b/src/cas/generic/caServer.cc
@@ -43,12 +43,18 @@ caServer::~caServer()
 	}
 }
 
-pvExistReturn caServer::pvExistTest (const casCtx &, const char *)
+pvExistReturn caServer::pvExistTest ( const casCtx & ctx, 
+	const caNetAddr & /* clientAddress */, const char * pPVAliasName )
+{
+    return this->pvExistTest ( ctx, pPVAliasName );
+}
+
+pvExistReturn caServer::pvExistTest ( const casCtx &, const char * )
 {
 	return pverDoesNotExistHere;
 }
 
-pvCreateReturn caServer::createPV (const casCtx &, const char *)
+pvCreateReturn caServer::createPV ( const casCtx &, const char * )
 {
 	return S_casApp_pvNotFound;
 }
diff --git a/src/cas/generic/casDGClient.cc b/src/cas/generic/casDGClient.cc
index 84e2b526d..51d14fecd 100644
--- a/src/cas/generic/casDGClient.cc
+++ b/src/cas/generic/casDGClient.cc
@@ -185,7 +185,7 @@ caStatus casDGClient::searchAction()
 	//
 	this->userStartedAsyncIO = false;
 	pvExistReturn pver = 
-		this->getCAS()->pvExistTest ( this->ctx, pChanName );
+		this->getCAS()->pvExistTest ( this->ctx, this->lastRecvAddr, pChanName );
 
 	//
 	// prevent problems when they initiate
diff --git a/src/cas/generic/casdef.h b/src/cas/generic/casdef.h
index 01cc9e197..96ae491cc 100644
--- a/src/cas/generic/casdef.h
+++ b/src/cas/generic/casdef.h
@@ -179,7 +179,7 @@ public:
 	// in the future.
 	//
 	epicsShareFunc virtual pvExistReturn pvExistTest ( const casCtx & ctx, 
-		const char * pPVAliasName );
+		const caNetAddr & clientAddress, const char * pPVAliasName );
 
 	//
 	// pvAttach() 
@@ -276,7 +276,9 @@ private:
 
 	// deprecated interfaces (will be deleted in a future release)
 	epicsShareFunc virtual class pvCreateReturn createPV ( const casCtx & ctx,
-		const char *pPVAliasName );
+		const char * pPVAliasName );
+	epicsShareFunc virtual pvExistReturn pvExistTest ( const casCtx & ctx, 
+		const char * pPVAliasName );
 };
 
 //
@@ -409,7 +411,7 @@ public:
     // (or a derived class) each time that this routine is called
     //
     epicsShareFunc virtual casChannel * createChannel ( const casCtx &ctx,
-        const char * const pUserName, const char * const pHostName);
+        const char * const pUserName, const char * const pHostName );
     
     //
     // tbe best type for clients to use when accessing the
diff --git a/src/makeBaseApp/top/caServerApp/exServer.cc b/src/makeBaseApp/top/caServerApp/exServer.cc
index 52a82129a..a3df1a342 100644
--- a/src/makeBaseApp/top/caServerApp/exServer.cc
+++ b/src/makeBaseApp/top/caServerApp/exServer.cc
@@ -152,7 +152,7 @@ void exServer::installAliasName(pvInfo &info, const char *pAliasName)
 // exServer::pvExistTest()
 //
 pvExistReturn exServer::pvExistTest // X aCC 361
-    ( const casCtx& ctxIn, const char * pPVName )
+    ( const casCtx& ctxIn, const caNetAddr &, const char * pPVName )
 {
     //
     // lifetime of id is shorter than lifetime of pName
diff --git a/src/makeBaseApp/top/caServerApp/exServer.h b/src/makeBaseApp/top/caServerApp/exServer.h
index aff5188ad..00fee3df1 100644
--- a/src/makeBaseApp/top/caServerApp/exServer.h
+++ b/src/makeBaseApp/top/caServerApp/exServer.h
@@ -283,7 +283,8 @@ private:
     bool scanOn;
 
     void installAliasName ( pvInfo & info, const char * pAliasName );
-    pvExistReturn pvExistTest ( const casCtx &, const char * pPVName );
+    pvExistReturn pvExistTest ( const casCtx &, 
+        const caNetAddr &, const char * pPVName );
     pvAttachReturn pvAttach ( const casCtx &, const char * pPVName );
 
     //