diff --git a/src/ioc/rsrv/camessage.c b/src/ioc/rsrv/camessage.c
index 469c29b80..51ab8f3a0 100644
--- a/src/ioc/rsrv/camessage.c
+++ b/src/ioc/rsrv/camessage.c
@@ -1126,7 +1126,7 @@ static void casAccessRightsCB(ASCLIENTPVT ascpvt, asClientStatus type)
     pclient = pciu->client;
     assert(pclient);
 
-    if(pclient == prsrv_cast_client){
+    if(pclient->proto==IPPROTO_UDP){
         return;
     }
 
@@ -1193,7 +1193,7 @@ static void access_rights_reply ( struct channel_in_use * pciu )
     int             v41;
     int             status;
 
-    assert ( pciu->client != prsrv_cast_client );
+    assert ( pciu->client->proto!=IPPROTO_UDP );
 
     /*
      * noop if this is an old client
@@ -1321,7 +1321,7 @@ static int claim_ciu_action ( caHdrLargeArray *mp,
         }
     }
     else {
-        epicsMutexMustLock(prsrv_cast_client->chanListLock);
+        epicsMutexMustLock(client->chanListLock);
         /*
          * clients which dont claim their
          * channel in use block prior to
@@ -1331,7 +1331,7 @@ static int claim_ciu_action ( caHdrLargeArray *mp,
         if(!pciu){
             errlogPrintf("CAS: client timeout disconnect id=%d\n",
                 mp->m_cid);
-            epicsMutexUnlock(prsrv_cast_client->chanListLock);
+            epicsMutexUnlock(client->chanListLock);
             SEND_LOCK(client);
             send_err(
                 mp,
@@ -1342,24 +1342,6 @@ static int claim_ciu_action ( caHdrLargeArray *mp,
             return RSRV_ERROR;
         }
 
-        /*
-         * duplicate claim message are unacceptable
-         * (so we disconnect the client)
-         */
-        if (pciu->client!=prsrv_cast_client) {
-            errlogPrintf("CAS: duplicate claim disconnect id=%d\n",
-                mp->m_cid);
-            epicsMutexUnlock(prsrv_cast_client->chanListLock);
-            SEND_LOCK(client);
-            send_err(
-                mp,
-                ECA_INTERNAL,
-                client,
-                "duplicate claim in old connect protocol");
-            SEND_UNLOCK(client);
-            return RSRV_ERROR;
-        }
-
         /*
          * remove channel in use block from
          * the UDP client where it could time
@@ -1367,9 +1349,9 @@ static int claim_ciu_action ( caHdrLargeArray *mp,
          * who is claiming it
          */
         ellDelete(
-            &prsrv_cast_client->chanList,
+            &client->chanList,
             &pciu->node);
-        epicsMutexUnlock(prsrv_cast_client->chanListLock);
+        epicsMutexUnlock(client->chanListLock);
 
         epicsMutexMustLock(client->chanListLock);
         pciu->state = rsrvCS_pendConnectResp;
@@ -2623,7 +2605,7 @@ int camessage ( struct client *client )
         if ( CASDEBUG > 2 )
             log_header (NULL, client, &msg, pBody, nmsg);
 
-        if ( client == prsrv_cast_client ) {
+        if ( client->proto==IPPROTO_UDP ) {
             if ( msg.m_cmmd < NELEMENTS ( udpJumpTable ) ) {
                 status = ( *udpJumpTable[msg.m_cmmd] )( &msg, pBody, client );
                 if (status!=RSRV_OK) {
diff --git a/src/ioc/rsrv/caservertask.c b/src/ioc/rsrv/caservertask.c
index 132fe462f..8b4ce4af4 100644
--- a/src/ioc/rsrv/caservertask.c
+++ b/src/ioc/rsrv/caservertask.c
@@ -300,7 +300,6 @@ int rsrv_init (void)
     freeListInitPvt ( &rsrvLargeBufFreeListTCP, rsrvSizeofLargeBufTCP, 1 );
     ellInit ( &casIntfAddrList );
     ellInit ( &beaconAddrList );
-    prsrv_cast_client = NULL;
     pCaBucket = NULL;
 
     castcp_startStopEvent = epicsEventMustCreate(epicsEventEmpty);
@@ -500,12 +499,12 @@ void casr (unsigned level)
         client = (struct client *) ellNext(&client->node);
     }
     UNLOCK_CLIENTQ
-
+/*
     if (level>=2 && prsrv_cast_client) {
         printf( "UDP Server:\n" );
         log_one_client(prsrv_cast_client, level);
     }
-
+*/
     if (level>=2u) {
         bytes_reserved = 0u;
         bytes_reserved += sizeof (struct client) *
diff --git a/src/ioc/rsrv/cast_server.c b/src/ioc/rsrv/cast_server.c
index 6089a078a..49d5e5078 100644
--- a/src/ioc/rsrv/cast_server.c
+++ b/src/ioc/rsrv/cast_server.c
@@ -54,7 +54,7 @@
 /*
  * clean_addrq
  */
-static void clean_addrq(void)
+static void clean_addrq(struct client *prsrv_cast_client)
 {
     struct channel_in_use * pciu;
     struct channel_in_use * pnextciu;
@@ -124,6 +124,7 @@ void cast_server(void *pParm)
     osiSocklen_t        recv_addr_size;
     osiSockIoctl_t      nchars;
     SOCKET              recv_sock;
+    struct client      *prsrv_cast_client;
 
     recv_addr_size = sizeof(new_recv_addr);
 
@@ -299,11 +300,11 @@ void cast_server(void *pParm)
         if (status<0) {
             errlogPrintf ("CA cast server: Unable to fetch N characters pending\n");
             cas_send_dg_msg (prsrv_cast_client);
-            clean_addrq ();
+            clean_addrq (prsrv_cast_client);
         }
         else if (nchars == 0) {
             cas_send_dg_msg (prsrv_cast_client);
-            clean_addrq ();
+            clean_addrq (prsrv_cast_client);
         }
     }
 }
diff --git a/src/ioc/rsrv/server.h b/src/ioc/rsrv/server.h
index 21016fab8..7ed3f6ec8 100644
--- a/src/ioc/rsrv/server.h
+++ b/src/ioc/rsrv/server.h
@@ -170,7 +170,6 @@ GLBLTYPE ELLLIST            clientQ; /* locked by clientQlock */
 GLBLTYPE ELLLIST            beaconAddrList;
 GLBLTYPE ELLLIST            casIntfAddrList;
 GLBLTYPE epicsMutexId       clientQlock;
-GLBLTYPE struct client      *prsrv_cast_client;
 GLBLTYPE BUCKET             *pCaBucket;
 GLBLTYPE void               *rsrvClientFreeList;
 GLBLTYPE void               *rsrvChanFreeList;