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INTRODUCTION
This article lists the Error Codes that you may receive when you try to make a dial-up connection or a VPN connection on a computer that is running Microsoft Windows Vista.
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The following list contains the Error Codes that you may receive when you try to make a dial-up connection or a VPN connection:600An operation is pending.601The port handle is invalid.602The port is already open.603Caller's buffer is too small.604Wrong information specified.606The port is not connected.608The device does not exist.609The device type does not exist.610The buffer is invalid.612The route is not allocated.615The port was not found.616An asynchronous request is pending.617The port or device is already disconnecting.618The port is not open.619The port is disconnected.621Cannot open the phone book file.622Cannot load the phone book file.623Cannot find the phone book entry.624Cannot write the phone book file.625Invalid information found in the phone book.627Cannot find key.628The port was disconnected.629The port was disconnected by the remote machine.630The port was disconnected due to hardware failure.631The port was disconnected by the user.632The structure size is incorrect.633The port is already in use or is not configured for Remote Access dialout.Note In this error message, the word "dialout" is a misspelling for the words "dial out."635Unknown error.636The wrong device is attached to the port.638The request has timed out.645Internal authentication error.646The account is not permitted to log on at this time of day.647The account is disabled.648The password has expired.649The account does not have Remote Access permission.651Your modem (or other connecting device) has reported an error.652Unrecognized response from the device.653A macro required by the device was not found in the device .INF file section.654A command or response in the device .INF file section refers to an undefined macro655The <message> macro was not found in the device .INF file section.656The <defaultoff> macro in the device .INF file section contains an undefined macro657The device .INF file could not be opened.658The device name in the device .INF or media .INI file is too long.659The media .INI file refers to an unknown device name.660The device .INF file contains no responses for the command.661The device .INF file is missing a command.662Attempted to set a macro not listed in device .INF file section.663The media .INI file refers to an unknown device type.664Cannot allocate memory.665The port is not configured for Remote Access.666Your modem (or other connecting device) is not functioning.667Cannot read the media .INI file.668The connection dropped.669The usage parameter in the media .INI file is invalid.670Cannot read the section name from the media .INI file.671Cannot read the device type from the media .INI file.672Cannot read the device name from the media .INI file.673Cannot read the usage from the media .INI file.676The phone line is busy.677A person answered instead of a modem.678There is no answer.679Cannot detect carrier.680There was no dial tone.691Access denied because username and/or password is invalid on the domain.692Hardware failure in port or attached device.693ERROR NOT BINARY MACRO694ERROR DCB NOT FOUND695ERROR STATE MACHINES NOT STARTED696ERROR STATE MACHINES ALREADY STARTED697ERROR PARTIAL RESPONSE LOOPING698A response keyname in the device .INF file is not in the expected format.699The device response caused buffer overflow.700The expanded command in the device .INF file is too long.701The device moved to a BPS rate not supported by the COM driver.702Device response received when none expected.703ERROR INTERACTIVE MODE704ERROR BAD CALLBACK NUMBER705ERROR INVALID AUTH STATE707X.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.713No active ISDN lines are available.716The Remote Access IP configuration is unusable.717No IP addresses are available in the static pool of Remote Access IP addresses.718PPP timeout.720No PPP control protocols configured.721Remote PPP peer is not responding.722The PPP packet is invalid.723The phone number, including prefix and suffix, is too long.726The IPX protocol cannot be used for dial-out on more than one port at a time.728Cannot find an IP adapter bound to Remote Access.729SLIP cannot be used unless the IP protocol is installed. 730Computer registration is not complete.731The protocol is not configured.732The PPP negotiation is not converging.733The PPP control protocol for this network protocol is not available on the server.734The PPP link control protocol terminated..735The requested address was rejected by the server.736The remote computer terminated the control protocol.737Loopback detected.738The server did not assign an address.739The remote server cannot use the Windows NT encrypted password.740The TAPI devices configured for Remote Access failed to initialize or were not installed correctly.741The local computer does not support encryption.742The remote server does not support encryption.749ERROR_BAD_PHONE_NUMBER752A syntax error was encountered while processing a script.753The connection could not be disconnected because it was created by the multi-protocol router.754The system could not find the multi-link bundle.755The system cannot perform automated dial because this connection has a custom dialer specified.756This connection is already being dialed.757Remote Access Services could not be started automatically. Additional information is provided in the event log.764No smart card reader is installed. 765Internet Connection Sharing cannot be enabled. A LAN connection is already configured with the IP address that is required for automatic IP addressing. 766A certificate could not be found. Connections that use the L2TP protocol over IPSec require the installation of a machine certificate, also known as a computer certificate. 767Internet Connection Sharing cannot be enabled. The LAN connection selected as the private network has more than one IP address configured. Please reconfigure the LAN connection with a single IP address before enabling Internet Connection Sharing. 768The connection attempt failed because of failure to encrypt data. 769The specified destination is not reachable. 770The remote computer rejected the connection attempt. 771The connection attempt failed because the network is busy. 772The remote computer's network hardware is incompatible with the type of call requested. 773The connection attempt failed because the destination number has changed. 774The connection attempt failed because of a temporary failure. Try connecting again.775The call was blocked by the remote computer. 776The call could not be connected because the remote computer has invoked the Do Not Disturb feature. 777The connection attempt failed because the modem (or other connecting device on the remote computer is out of order. 778It was not possible to verify the identity of the server. 780An attempted function is not valid for this connection. 782Internet Connection Sharing (ICS and Internet Connection Firewall (ICF cannot be enabled because Routing and Remote Access has been enabled on this computer. To enable ICS or ICF, first disable Routing and Remote Access. For more information about Routing and Remote Access, ICS, or ICF, see Help and Support. 783Internet 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. 784You 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. 785You 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. 786The L2TP connection attempt failed because there is no valid machine certificate on your computer for security authentication. 787The L2TP connection attempt failed because the security layer could not authenticate the remote computer. 788The L2TP connection attempt failed because the security layer could not negotiate compatible parameters with the remote computer. 789The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer. 790The L2TP connection attempt failed because certificate validation on the remote computer failed. 791The L2TP connection attempt failed because security policy for the connection was not found. 792The L2TP connection attempt failed because security negotiation timed out. 793The L2TP connection attempt failed because an error occurred while negotiating security. 794The Framed Protocol RADIUS attribute for this user is not PPP. 795The Tunnel Type RADIUS attribute for this user is not correct. 796The Service Type RADIUS attribute for this user is neither Framed nor Callback Framed. 797A connection to the remote computer could not be established because the modem was not found or was busy. For further assistance, click More Info or search Help and Support Center for this error number. 798A certificate could not be found that can be used with this Extensible Authentication Protocol. 799Internet 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. 800Unable to establish the VPN connection. The VPN server may be unreachable, or security parameters may not be configured properly for this connection. 801This connection is configured to validate the identity of the access server, but Windows cannot verify the digital certificate sent by the server.802The card supplied was not recognized. Please check that the card is inserted correctly, and fits tightly.803The PEAP configuration stored in the session cookie does not match the current session configuration.804The PEAP identity stored in the session cookie does not match the current identity.805You cannot dial using this connection at logon time, because it is configured to use logged on user's credentials.806A connection between your computer and the VPN server has been started, but the VPN connection cannot be completed. The most common cause for this is that at least one Internet device (for example, a firewall or a router) between your computer and the VPN server is not configured to allow Generic Routing Encapsulation (GRE) protocol packets. If the problem persists, contact your network administrator or Internet service provider.807The network connection between your computer and the VPN server was interrupted. This can be caused by a problem in the VPN transmission and is commonly the result of internet latency or simply that your VPN server has reached capacity. Please try to reconnect to the VPN server. If this problem persists, contact the VPN administrator and analyze quality of network connectivity.808The network connection between your computer and the VPN server could not be established because the remote server refused the connection. This is typically caused by a mismatch between the server's configuration and your connection settings. Please contact the remote server's Administrator to verify the server configuration and your connection settings.809The network connection between your computer and the VPN server could not be established because the remote server is not responding. This could be because one of the network devices (e.g., firewalls, NAT, routers, etc.) between your computer and the remote server is not configured to allow VPN connections. Please contact your Administrator or your service provider to determine which device may be causing the problem.810A network connection between your computer and the VPN server was started, but the VPN connection was not completed. This is typically caused by the use of an incorrect or expired certificate for authentication between the client and the server. Please contact your Administrator to ensure that the certificate being used for authentication is valid.811The network connection between your computer and the VPN server could not be established because the remote server is not responding. This is typically caused by a pre-shared key problem between the client and server. A pre-shared key is used to guarantee you are who you say you are in an IP Security (IPSec) communication cycle. Please get the assistance of your administrator to determine where the pre-shared key problem is originating.812The connection was prevented because of a policy configured on your RAS/VPN server. Specifically, the authentication method used by the server to verify your username and password may not match the authentication method configured in your connection profile. Please contact the Administrator of the RAS server and notify them of this error.813You have attempted to establish a second broadband connection while a previous broadband connection is already established using the same device or port. Please disconnect the earlier connection and then re-establish the connection.814The underlying Ethernet connectivity required for the broadband connection was not found. Please install and enable the Ethernet adapter on your computer via the Network Connections folder before attempting this connection.815The broadband network connection could not be established on your computer because the remote server is not responding. This could be caused by an invalid value for the 'Service Name' field for this connection. Please contact your Internet Service Provider and inquire about the correct value for this field and update it in the Connection Properties.816A feature or setting you have tried to enable is no longer supported by the remote access service.817Cannot delete a connection while it is connected.818The Network Access Protection (NAP) enforcement client could not create system resources for remote access connections. Some network services or resources might not be available. If the problem persists, disconnect and retry the remote access connection or contact the administrator for the remote access server.819The Network Access Protection Agent (NAP Agent) service has been disabled or is not installed on this computer. Some network services or resources might not be available. If the problem persists, disconnect and retry the remote access connection or contact the administrator for the remote access server.820The Network Access Protection (NAP) enforcement client failed to register with the Network Access Protection Agent (NAP Agent) service. Some network services or resources might not be available. If the problem persists, disconnect and retry the remote access connection or contact the administrator for the remote access server.821The Network Access Protection (NAP) enforcement client was unable to process the request because the remote access connection does not exist. Retry the remote access connection. If the problem persists, make sure that you can connect to the Internet, and then contact the administrator for the remote access server.822The Network Access Protection (NAP) enforcement client did not respond. Some network services or resources might not be available. If the problem persists, disconnect and retry the remote access connection or contact the administrator for the remote access server.823Received Crypto-Binding TLV is invalid.824Crypto-Binding TLV is not received.825Point-to-Point Tunnelling Protocol (PPTP) is incompatible with IPv6. Change the type of virtual private network to Layer Two Tunnelling Protocol (L2TP)Note In this 8255 error message, the word "Tunnelling" is a misspelling for the word "Tunneling."826EAPTLS validation of the cached credentials failed. Please discard cached credentials.827The L2TP/IPsec connection cannot be completed because the IKE and AuthIP IPSec Keying Modules service and/or the Base Filtering Engine service is not running. These services are required to establish an L2TP/IPSec connection. Please ensure that these services have been started before dialling the connectionNote In this 827 error message, the word "dialling" is a misspelling for the word "dialing."
