diff -Naur squid-3.1.20.orig/src/external_acl.cc squid-3.1.20/src/external_acl.cc
--- squid-3.1.20.orig/src/external_acl.cc	2012-07-05 18:48:13.000000000 +0400
+++ squid-3.1.20/src/external_acl.cc	2012-07-11 17:36:18.303403224 +0400
@@ -714,7 +714,7 @@
     if (entry) {
         if (cbdataReferenceValid(entry) && entry->def == acl->def) {
             /* Ours, use it.. if the key matches */
-            key = makeExternalAclKey(ch, acl);
+//            key = makeExternalAclKey(ch, acl);
             if (strcmp(key, (char*)entry->key) != 0) {
                 debugs(82, 9, HERE << "entry key='" << (char *)entry->key << "', our key='" << key << "' dont match. Discarded.");
                 // too bad. need a new lookup.