diff --git a/xwords4/android/XWords4/res/values/strings.xml b/xwords4/android/XWords4/res/values/strings.xml
index 811fd81ef..ff43e8db9 100644
--- a/xwords4/android/XWords4/res/values/strings.xml
+++ b/xwords4/android/XWords4/res/values/strings.xml
@@ -216,6 +216,11 @@
     <string name="msg_relay_all_here">All players are here.</string>
     <string name="title_relay_status">Connection status.</string>
 
+    <string name="relay_alert">Connection error</string>
+    <string name="msg_too_many">You are providing more players than the host expects.</string>
+    <string name="msg_no_room">No host has registered a room by that name.</string>
+    <string name="msg_dup_room">Another host has already registered a room using that name.  Rename yours or retry later.</string>
+    <string name="msg_lost_other">The relay has lost contact with another device in this game.</string>
 
     <!-- These do not require localization -->
     <string name="key_color_tiles">key_color_tiles</string>
diff --git a/xwords4/android/XWords4/src/org/eehouse/android/xw4/CommsTransport.java b/xwords4/android/XWords4/src/org/eehouse/android/xw4/CommsTransport.java
index 6c2e31afe..28228f953 100644
--- a/xwords4/android/XWords4/src/org/eehouse/android/xw4/CommsTransport.java
+++ b/xwords4/android/XWords4/src/org/eehouse/android/xw4/CommsTransport.java
@@ -313,5 +313,42 @@ public class CommsTransport extends Thread implements TransportProcs {
     public void relayErrorProc( XWRELAY_ERROR relayErr )
     {
         Utils.logf( "relayErrorProc called; got " + relayErr.toString() );
+
+        int strID = 0;
+        int how = TOAST;
+
+        switch ( relayErr ) {
+        case TOO_MANY: 
+            strID = R.string.msg_too_many;
+            how = DIALOG;
+            break;
+        case NO_ROOM:
+            strID = R.string.msg_no_room;
+            how = DIALOG;
+            break;
+        case DUP_ROOM:
+            strID = R.string.msg_dup_room;
+            how = DIALOG;
+            break;
+        case LOST_OTHER:
+        case OTHER_DISCON:
+            strID = R.string.msg_lost_other;
+            break;
+
+        case OLDFLAGS:
+        case BADPROTO:
+        case RELAYBUSY:
+        case SHUTDOWN:
+        case TIMEOUT:
+        case HEART_YOU:
+        case HEART_OTHER:
+            break;
+        }
+
+        if ( 0 != strID ) {
+            String str = m_context.getString( strID );
+            Message.obtain( m_handler, how, R.string.relay_alert, 
+                            0, str ).sendToTarget();
+        }
     }
 }