Index: src/server/sv_client.c
===================================================================
--- src/server/sv_client.c	(revision 1043)
+++ src/server/sv_client.c	(working copy)
@@ -78,7 +78,10 @@
 	}
 
 	// send the challengeResponse
-	challenge->pingTime = svs.time;
+	if ( !challenge->inuse ) {
+		challenge->pingTime = svs.time;
+		challenge->inuse = qtrue;
+	}
 	NET_OutOfBandPrint( NS_SERVER, from, "challengeResponse %i", challenge->challenge );
 }
 
@@ -341,6 +344,7 @@
 	for (i = 0 ; i < MAX_CHALLENGES ; i++, challenge++) {
 		if ( NET_CompareAdr( drop->netchan.remoteAddress, challenge->adr ) ) {
 			challenge->connected = qfalse;
+			challenge->inuse = qfalse;
 			break;
 		}
 	}
Index: src/server/server.h
===================================================================
--- src/server/server.h	(revision 1043)
+++ src/server/server.h	(working copy)
@@ -189,6 +189,7 @@
 	int			pingTime;			// time the challenge response was sent to client
 	int			firstTime;			// time the adr was first used, for authorize timeout checks
 	qboolean	connected;
+	qboolean	inuse;
 } challenge_t;