Mobile Version
Windows Errors
Mac Errors
General RAS/NAS
Cisco VPN Error Codes
Android Error Codes
SS7 Cause Codes
Ascend Error Codes
menu dot Fiber Optics Help
Microsoft Surface Article
Microsoft Surface MINI Article
Latest News
Contact Us

Custom Search

Thank you for visiting windows-error-codes

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, XP, Vista, and Windows 7 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 ProvidedError Message
0YesConnection successful!
2YesThe system cannot find the file specified.
5YesAccess Denied.
6YesStack overflow.
20YesThe system cannot find the device specified.
71YesNo more connections allowed.
380YesInvalid Property Value.
600YesAn operation is pending.
601YesThe port handle is invalid.
602YesThe port is already open.
603YesCaller's buffer is too small.
604YesWrong information specified.
605YesCannot set port information.
606YesThe port is not connected.
607YesThe event is invalid.
608YesThe device does not exist.
609YesThe device type does not exist.
610YesThe buffer is invalid.
611YesThe route is not available.
612YesThe route is not allocated.
613YesInvalid compression specified.
614YesOut of Buffers When Using RAS Script.
615YesThe port was not found.
616YesAn asynchronous request is pending.
617YesThe port or device is already disconnecting.
618YesThe port is not open.
619YesThe port is disconnected.
620YesThere are no endpoints.
621YesCannot open the phone book file.
622YesCannot load the phone book file.
623YesCannot find the phone book entry.
624YesCannot write the phone book file.
625YesInvalid information found in the phone book.
626YesCannot load a string.
627YesCannot find key.
628YesThe port was disconnected.
629YesThe port was disconnected by the remote machine.
630YesThe port was disconnected due to hardware failure.
631YesThe port was disconnected by the user.
632YesThe structure size is incorrect.
633Yes<The port is already in use or is not configured for Remote Access dialout.
634YesCannot register your computer on the remote network.
635YesUnknown error.
636YesThe wrong device is attached to the port.
637YesThe string could not be converted.
638YesThe request has timed out.
639YesNo asynchronous net available.
640YesA NetBIOS error has occurred.
641YesThe server cannot allocate NetBIOS resources needed to support the client.
642YesOne of your NetBIOS names is already registered on the remote network.
643YesA network adapter at the server failed.
644YesYou will not receive network message popups.
645YesInternal authentication error.
646YesThe account is not permitted to log on at this time of day.
647YesThe account is disabled.
648YesThe password has expired.
649YesThe account does not have Remote Access permission.
650YesThe Remote Access server is not responding.
651YesYour modem (or other connecting device) has reported an error.
656YesThe <defaultoff> macro in the device .INF file section contains an undefined macro
657YesThe device .INF file could not be opened.
659YesThe media .INI file refers to an unknown device name.
661YesThe device .INF file is missing a command.
664YesCannot allocate memory.
665YesThe port is not configured for Remote Access.
666>YesYour modem (or other connecting device) is not functioning.
667YesCannot read the media .INI file.
668YesThe connection dropped.
676YesThe line is busy.
677YesA person answered instead of a modem.
678YesThere is no answer.
679YesCannot detect carrier.
680YesThere is no dial tone.
691Yes>Access denied because username and/or password is invalid on the domain.
692YesHardware failure in port or attached device.
707X.25 diagnostic indication.
708The account has expired.
709Error changing password on domain.
710Serial overrun errors were detected while communicating with your modem.
711RasMan initialization failure. Check the event log.
712Biplex port is initializing. Wait a few seconds and redial.
713Yes No active ISDN lines are available.
713Yes VB:Run-Time Error 713 Opening Data Report in Distributed Application
714Yes 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.
717Yes 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.
766YesError setting up VPN connection client - (The system could not find any certificate.)
767YesInternet 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.
768YesThe connection attempt failed because of failure to encrypt data.
769YesThe specified destination is not reachable.
770YesThe remote machine rejected the connection attempt.
771YesThe connection attempt failed because the network is busy.
772YesThe remote computer's network hardware is incompatible with the type of call requested.
773YesThe connection attempt failed because the destination number has changed.
774YesThe connection attempt failed because of a temporary failure. Try connecting again.
774YesWindows Media Center fails to record.
775YesThe call was blocked by the remote computer.
776YesThe call could not be connected because the destination has invoked the Do Not Disturb feature.
777YesThe connection attempt failed because the modem on the remote computer is out of order.
778YesIt was not possible to verify the identity of the server.
779YesTo dial out using this connection, you must use a smart card OR Windows Update (Business Contact Manager for Outlook 2007).
780YesAn attempted function is not valid for this connection.
780YesVista Windows Update Error 780
781YesThe encryption attempt failed because no valid certificate was found.
782YesNetwork Address Translation (NAT) is currently installed as a routing protocol, and must be removed before enabling Internet Connection Sharing
783YesInternet 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
797YesA connection to the remote computer could not be established because the modem was not found or was busy
798YesA certificate could not be found that can be used with this Extensible Authentication Protocol
>799YesInternet Connection Sharing (ICS) cannot be enabled due to an IP address conflict on the network. ICS requires the host be configured to use Please ensure that no other client on the network is configured to use
800YesUnable 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.

If you have any questions, feel free to email our technical support department at

Part of the ModemHelp Network Solutions Family