--- connection.c.orig	Thu Apr 13 05:06:26 2000
+++ connection.c	Thu Apr 13 05:15:54 2000
@@ -310,6 +310,7 @@
 static void processResponse436 (Connection cxn, char *response) ;
 static void processResponse437 (Connection cxn, char *response) ;
 static void processResponse480 (Connection cxn, char *response) ;
+static void processResponse500 (Connection cxn, char *response) ;
 
 
 /* Misc functions */
@@ -1792,7 +1793,10 @@
           case 480:             /* Transfer permission denied. */
             processResponse480  (cxn,response) ;
             break ;
-            
+
+          case 500:             /* command not recognized */
+            processResponse500 (cxn, response) ;
+            break;
 
           default:
             syslog (LOG_ERR, UNKNOWN_RESPONSE, peerName, cxn->ident,
@@ -3107,6 +3111,88 @@
 }
 
 
+static void processResponse500 (Connection cxn, char *response)
+{
+  ArtHolder artHolder ;
+
+  if (!cxn->doesStreaming)
+    {
+        /* we got a 500 answer in response to IHAVE */
+        if (!(cxn->state == cxnFlushingS ||
+              cxn->state == cxnFeedingS ||
+              cxn->state == cxnClosingS))
+          {
+            syslog (LOG_ERR,CXN_BAD_STATE,hostPeerName (cxn->myHost),
+                    cxn->ident,stateToString (cxn->state)) ;
+            cxnSleepOrDie (cxn) ;
+            return ;
+          }
+
+        ASSERT (cxn->articleQTotal == 1) ;
+        ASSERT (cxn->checkRespHead != NULL) ;
+        VALIDATE_CONNECTION (cxn) ;
+
+        cxn->articleQTotal-- ;
+        cxn->checksRefused++ ;
+
+        artHolder = cxn->checkRespHead ;
+        cxn->checkRespHead = NULL ;
+
+        if (cxn->articleQTotal == 0)
+          cxnIdle (cxn) ;
+
+        hostArticleNotWanted (cxn->myHost, cxn, artHolder->article) ;
+        delArtHolder (artHolder) ;
+        return;
+    }
+
+  /* We are streaming, so the 500 is either a reply to
+     CHECK or TAKETHIS */  
+  if (!(cxn->state == cxnFlushingS ||
+        cxn->state == cxnFeedingS ||
+        cxn->state == cxnClosingS))
+    {
+      syslog (LOG_ERR,CXN_BAD_STATE,hostPeerName (cxn->myHost),
+              cxn->ident,stateToString (cxn->state)) ;
+      cxnSleepOrDie (cxn) ;
+      return ;
+    }
+  
+  VALIDATE_CONNECTION (cxn) ;
+
+  /* CHECK */
+  if (cxn->checkRespHead != NULL)
+    {
+      cxn->checksRefused++ ;
+      artHolder = cxn->checkRespHead ;
+      remArtHolder (artHolder, &cxn->checkRespHead, &cxn->articleQTotal) ;
+      if (cxn->articleQTotal == 0)
+        cxnIdle (cxn) ;
+      hostArticleNotWanted (cxn->myHost, cxn, artHolder->article);
+      delArtHolder (artHolder) ;
+    }
+  /* TAKETHIS */
+  else if (cxn->takeRespHead != NULL)
+    {
+      cxn->takesRejected++ ;
+      artHolder = cxn->takeRespHead ;
+      remArtHolder (artHolder, &cxn->takeRespHead, &cxn->articleQTotal) ;
+      /* Some(?) hosts return the 500 response even before we're done
+          sending */ 
+      if (cxn->articleQTotal == 0 && !writeIsPending(cxn->myEp))
+        cxnIdle (cxn) ;
+      hostArticleRejected (cxn->myHost, cxn, artHolder->article) ;
+      delArtHolder (artHolder) ;
+    }
+  else
+    {
+      syslog (LOG_NOTICE,BAD_RESPONSE,
+              hostPeerName (cxn->myHost),cxn->ident,438) ;
+      cxnSleepOrDie (cxn) ;
+      return ;
+    }
+
+}