--- client_side.c.orig	Sun Jun  7 22:26:37 1998
+++ client_side.c	Sun Jun  7 22:27:18 1998
@@ -171,12 +171,20 @@
 		     ICP_IDENT_SZ);
 	    xstrncpy(sent_user, clear_userandpw, ICP_IDENT_SZ);
 	    xfree(clear_userandpw);
-	    s = strstr(sent_user, ":");
-	    *s = '\0'; s++;
-	    xstrncpy(icpState->ident.ident, sent_user, ICP_IDENT_SZ);
-	    /* we need this in authenticate.c */
-	    xstrncpy(icpState->ident.passwd, s, ICP_IDENT_SZ);
-	    proxy_auth_hdr = 1;
+	    if ((s = strstr(sent_user, ":")) != NULL) {
+		*s = '\0'; s++;
+		xstrncpy(icpState->ident.ident, sent_user, ICP_IDENT_SZ);
+		/* we need this in authenticate.c */
+		xstrncpy(icpState->ident.passwd, s, ICP_IDENT_SZ);
+		proxy_auth_hdr = 1;
+	    } else {
+		/* invalid Basic proxy authorization */
+		s = mime_get_header(icpState->request_hdr,
+				    "Proxy-authorization:");
+		debug(33, 0, "clientAccessCheck: invalid proxy authorization header: %s\n",
+		      s);
+		xstrncpy(icpState->aclChecklist->auth.basic, "-:-", ICP_IDENT_SZ);
+	    }
 	}
     }
 #endif /* USE_PROXY_AUTH */