diff -ur squid-ntlm-orig/ntlm_auth_modules/NTLMSSP/libntlmssp.c squid-ntlm/ntlm_auth_modules/NTLMSSP/libntlmssp.c
--- squid-ntlm-orig/ntlm_auth_modules/NTLMSSP/libntlmssp.c	Thu Oct 19 18:42:45 2000
+++ squid-ntlm/ntlm_auth_modules/NTLMSSP/libntlmssp.c	Thu Oct 19 18:59:11 2000
@@ -24,6 +24,9 @@
 #if HAVE_STDLIB_H
 #include <stdlib.h>
 #endif /* HAVE_STDLIB_H */
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
 
 #include "smblib-priv.h"				/* for SMB_Handle_Type */
 
@@ -212,7 +215,7 @@
 int ntlm_errno;
 static char credentials[1024];	/* we can afford to waste */
 char * ntlm_check_auth(struct ntlm_authenticate * auth, int auth_length) {
-	int rv;
+	int rv, retries=0;
 	char pass[25];
 	char *domain=credentials;
 	char *user;
@@ -258,6 +261,13 @@
 	debug("checking domain: '%s', user: '%s', pass='%s'\n",domain,user,pass);
 
 	rv=SMB_Logon_Server(handle,user,pass,domain,1);
+
+	while ( (rv == NTLM_BAD_PROTOCOL || rv==NTLM_SERVER_ERROR)
+					&& retries < BAD_DC_RETRIES_NUMBER) {
+		retries++;
+		usleep ((unsigned long)100000);
+		rv=SMB_Logon_Server(handle,user,pass,domain,1);
+	}
 
 	debug("\tresult is %d\n",rv);
 	
diff -ur squid-ntlm-orig/ntlm_auth_modules/NTLMSSP/ntlm.h squid-ntlm/ntlm_auth_modules/NTLMSSP/ntlm.h
--- squid-ntlm-orig/ntlm_auth_modules/NTLMSSP/ntlm.h	Thu Oct 19 18:42:45 2000
+++ squid-ntlm/ntlm_auth_modules/NTLMSSP/ntlm.h	Thu Oct 19 18:58:56 2000
@@ -66,6 +66,13 @@
 extern time_t inactivity_timeout;
 
 
+/*
+ * Number of retries when some kinds of errors occur with the Domain
+ * Controller. Keep it reasonable...
+ */
+#define BAD_DC_RETRIES_NUMBER 3
+
+
 /************* END CONFIGURATION ***************/
 
 #include <sys/types.h>