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I know its a long list. But it should be a little faster in finding out what an error means, then to go to the MS site.

Here?s a list of the error codes that DUN and RAS will give and what their definitions are.
Windows 95/98, ME, NT, 2000/2003 and XP all tend to word these a little differently but the general problem/solution is the same.

Note:These 'solutions' are recomendations based on tech support reps experience with the error code reported.



Error #	Solution	Error Message
0	Yes	The system cannot find the file specified.
2	Yes	The system cannot find the file specified.
5	Yes	Access Denied.
6	Yes	Stack overflow.
20	Yes	The system cannot find the device specified.
71	Yes	No more connections allowed.
380	Yes	Invalid Property Value.
600	Yes	An operation is pending.
601	Yes	The port handle is invalid.
602	Yes	The port is already open.
603	Yes	Caller's buffer is too small.
604	Yes	Wrong information specified.
605	Yes	Cannot set port information.
606	Yes	The port is not connected.
607	Yes	The event is invalid.
608	Yes	The device does not exist.
609	Yes	The device type does not exist.
610	Yes	The buffer is invalid.
611	Yes	The route is not available.
612	Yes	The route is not allocated.
613	Yes	Invalid compression specified.
614	Yes	Out of Buffers When Using RAS Script.
615	Yes	The port was not found.
616	Yes	An asynchronous request is pending.
617	Yes	The port or device is already disconnecting.
618	---	The port is not open.
619	---	The port is disconnected.
620	---	There are no endpoints.
621	---	Cannot open the phone book file.
622	---	Cannot load the phone book file.
623	---	Cannot find the phone book entry.
624	---	Cannot write the phone book file.
625	---	Invalid information found in the phone book.
626	---	Cannot load a string.
627	---	Cannot find key.
628	---	The port was disconnected.
629	---	The port was disconnected by the remote machine.
630	---	The port was disconnected due to hardware failure.
631	---	The port was disconnected by the user.
632	---	The structure size is incorrect.
633	---	The port is already in use or is not configured for Remote Access dialout.
634	---	Cannot register your computer on the remote network.
635	---	Unknown error.
636	---	The wrong device is attached to the port.
637	---	The string could not be converted.
638	---	The request has timed out.
639	---	No asynchronous net available.
640	---	A NetBIOS error has occurred.
641	---	The server cannot allocate NetBIOS resources needed to support the client.
642	---	One of your NetBIOS names is already registered on the remote network.
643	---	A network adapter at the server failed.
644	---	You will not receive network message popups.
645	---	Internal authentication error.
646	Yes	The account is not permitted to log on at this time of day.
647	Yes	The account is disabled.
648	Yes	The password has expired.
649	Yes	The account does not have Remote Access permission.
650	---	The Remote Access server is not responding.
651	Yes	Your modem (or other connecting device) has reported an error.
652	---	Unrecognized response from the device.
653	---	A macro required by the device was not found in the device .INF file section.
654	---	A command or response in the device .INF file section refers to an undefined macro
655	---	The <message> macro was not found in the device .INF file section.
656	---	The <defaultoff> macro in the device .INF file section contains an undefined macro
657	---	The device .INF file could not be opened.
658	---	The device name in the device .INF or media .INI file is too long.
659	---	The media .INI file refers to an unknown device name.
660	---	The device .INF file contains no responses for the command.
661	---	The device .INF file is missing a command.
662	---	Attempted to set a macro not listed in device .INF file section.
663	---	The media .INI file refers to an unknown device type.
664		Cannot allocate memory.
665	---	The port is not configured for Remote Access.
666	---	Your modem (or other connecting device) is not functioning.
667	---	Cannot read the media .INI file.
668	---	The connection dropped.
669	---	The usage parameter in the media .INI file is invalid.
670	---	Cannot read the section name from the media .INI file.
671	---	Cannot read the device type from the media .INI file.
672	--	Cannot read the device name from the media .INI file.
673	---	Cannot read the usage from the media .INI file.
674	---	Cannot read the maximum connection BPS rate from the media .INI file.
675	---	Cannot read the maximum carrier BPS rate from the media .INI file.
676	---	The line is busy.
677	---	A person answered instead of a modem.
678	Yes	There is no answer.
679	---	Cannot detect carrier.
680	Yes	There is no dial tone.
681	---	General error reported by device.
682	---	ERROR WRITING SECTIONNAME
683	---	ERROR WRITING DEVICETYPE
684	---	ERROR WRITING DEVICENAME
685	---	ERROR WRITING MAXCONNECTBPS
686	---	ERROR WRITING MAXCARRIERBPS
687	---	ERROR WRITING USAGE
688	---	ERROR WRITING DEFAULTOFF
689	---	ERROR READING DEFAULTOFF
690	---	ERROR EMPTY INI FILE
691	Yes	Access denied because username and/or password is invalid on the domain.
692		Hardware failure in port or attached device.
693	---	ERROR NOT BINARY MACRO
694	---	ERROR DCB NOT FOUND
695	---	ERROR STATE MACHINES NOT STARTED
696	---	ERROR STATE MACHINES ALREADY STARTED
697	---	ERROR PARTIAL RESPONSE LOOPING
698	---	A response keyname in the device .INF file is not in the expected format.
699	---	The device response caused buffer overflow.
700	---	The expanded command in the device .INF file is too long.
701	---	The device moved to a BPS rate not supported by the COM driver.
702	----	Device response received when none expected.
703	---	ERROR INTERACTIVE MODE
704	----	ERROR BAD CALLBACK NUMBER
705	---	ERROR INVALID AUTH STATE
706		ERROR WRITING INITBPS
707		X.25 diagnostic indication.
708		The account has expired.
709		Error changing password on domain.
710		Serial overrun errors were detected while communicating with your modem.
711		RasMan initialization failure. Check the event log.
712		Biplex port is initializing. Wait a few seconds and redial.
713	---	No active ISDN lines are available.
714	---	Not enough ISDN channels are available to make the call.
715	---	Too many errors occurred because of poor phone line quality.
716	---	The Remote Access IP configuration is unusable.
717	---	No IP addresses are available in the static pool of Remote Access IP addresses.
718	---	PPP timeout.
719	---	PPP terminated by remote machine.
720	---	No PPP control protocols configured.
721	---	Remote PPP peer is not responding.
722	---	The PPP packet is invalid.
723	---	The phone number, including prefix and suffix, is too long.
724	---	The IPX protocol cannot dial-out on the port because the computer is an IPX router.
725	---	The IPX protocol cannot dial-in on the port because the IPX router is not installed..
726	---	The IPX protocol cannot be used for dial-out on more than one port at a time.
727	---	Cannot access TCPCFG.DLL.
728	---	Cannot find an IP adapter bound to Remote Access.
729	---	SLIP cannot be used unless the IP protocol is installed.
730	---	Computer registration is not complete.
731	---	The protocol is not configured.
732	---	The PPP negotiation is not converging.
733	---	The PPP control protocol for this network protocol is not available on the server.
734	---	The PPP link control protocol terminated..
735	---	The requested address was rejected by the server..
736	---	The remote computer terminated the control protocol.
737	---	Loopback detected..
738	---	The server did not assign an address.
739	---	The remote server cannot use the Windows NT encrypted password.
740	---	The TAPI devices configured for Remote Access failed to initialize or were not installed correctly.
741	---	The local computer does not support encryption.
742	---	The remote server does not support encryption.
743	---	The remote server requires encryption.
744	---	Cannot use the IPX net number assigned by the remote server. Check the event log.
745	---	An essential file is missing.
746	---	An essential file failed to initialize.
747	---	MAC not found.
748	---	The system timed out while trying to load an essential file.
749	---	Invalid phone number.
750	---	Invalid authentication attempt.
751	---	The callback number contains an invalid character. Only the following characters are allowed: 0 to 9, T, P, W, (,), -, @, and space
752	---	A syntax error was encountered while processing a script.
753	---	The connection could not be disconnected because it was created by the multi-protocol router.
754	---	The system could not find the multi-link bundle.
755	---	The system cannot perform automated dial because this entry has a custom dialer specified.
756	---	This connection is already being dialed.
757	---	Remote access services could not be started automatically. Additional information is provided in the event log.
758	---	Internet connection sharing is already enabled on the connection.
760	---	An error occurred while routing capabilities were being enabled.
761	---	An error occurred while Internet connection sharing was being enabled for the connection.
763	---	Internet connection sharing cannot be enabled. There are two or more LAN connections in addition to the connection to be shared.
764	---	No smart card reader is installed.
765	---	Internet connection sharing cannot be enabled. A LAN connection is already configured with the IP address required for automatic IP addressing.
766	---	The system could not find any certificate.
767	---	Internet connection sharing cannot be enabled. The LAN connection selected on the private network has more than one IP address configured. Reconfigure the LAN connection with a single IP address before enabling Internet connection sharing.
768	---	The connection attempt failed because of failure to encrypt data.
769	---	The specified destination is not reachable.
770	---	The remote machine rejected the connection attempt.
771	---	The connection attempt failed because the network is busy.
772	---	The remote computer's network hardware is incompatible with the type of call requested.
773	---	The connection attempt failed because the destination number has changed.
774	---	The connection attempt failed because of a temporary failure. Try connecting again.
775	---	The call was blocked by the remote computer.
776	---	The call could not be connected because the destination has invoked the Do Not Disturb feature.
777	Yes	The connection attempt failed because the modem on the remote computer is out of order.
778	---	It was not possible to verify the identity of the server.
779	---	To dial out using this connection, you must use a smart card.
780	---	An attempted function is not valid for this connection.
781	---	The encryption attempt failed because no valid certificate was found.
782	---	Network Address Translation (NAT) is currently installed as a routing protocol, and must be removed before enabling Internet Connection Sharing
783	---	Internet Connection Sharing cannot be enabled. The LAN connection selected as the private network is either not present, or is disconnected from the network. Please ensure that the LAN adapter is connected before enabling Internet Connection Sharing
784	---	You cannot dial using this connection at logon time, because it is configured to use a user name different than the one on the smart card. If you want to use it at logon time, you must configure it to use the user name on the smart card
785	---	You cannot dial using this connection at logon time, because it is not configured to use a smart card. If you want to use it at logon time, you must edit the properties of this connection so that it uses a smart card
786	---	The L2TP connection attempt failed because there is no valid machine certificate on your computer for security authentication
787	---	The L2TP connection attempt failed because the security layer could not authenticate the remote computer
788	---	The L2TP connection attempt failed because the security layer could not negotiate compatible parameters with the remote computer
789	---	The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer
790	---	The L2TP connection attempt failed because certificate validation on the remote computer failed
791	---	The L2TP connection attempt failed because security policy for the connection was not found
792	---	The L2TP connection attempt failed because security negotiation timed out
793	---	The L2TP connection attempt failed because an error occurred while negotiating security
794	---	The Framed Protocol RADIUS attribute for this user is not PPP
795	---	The Tunnel Type RADIUS attribute for this user is not correct
796	---	The Service Type RADIUS attribute for this user is neither Framed nor Callback Framed
797	---	A connection to the remote computer could not be established because the modem was not found or was busy
798	---	A certificate could not be found that can be used with this Extensible Authentication Protocol
799	---	Internet Connection Sharing (ICS) cannot be enabled due to an IP address conflict on the network. ICS requires the host be configured to use 192.168.0.1. Please ensure that no other client on the network is configured to use 192.168.0.1
800	---	Unable to establish the VPN connection. The VPN server may be un-reachable, or security parameters may not be configured properly for this connection
995	---	Operation aborted.
1382	---	Maximum length exceeded.
1793	---	Account expired.
2250	---	Network connection does not exist.