| 600 : | An operation is pending. |
| 601 : | The port handle is invalid. |
| 602 : | The port is already open. |
| 603 : | Caller's buffer is too small. |
| 604 : | Wrong information specified. |
| 605 : | Cannot set port information. |
| 606 : | The port is not connected. |
| 607 : | The event is invalid. |
| 608 : | The device does not exist. |
| 609 : | The device type does not exist. |
| 610 : | The buffer is invalid. |
| 611 : | The route is not available. |
| 612 : | The route is not allocated. |
| 613 : | Invalid compression specified. |
| 614 : | Out of buffers. |
| 615 : | The port was not found. |
| 616 : | An asynchronous request is pending. |
| 617 : | 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 dial out. |
| 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 : | The account is not permitted to log on at this time of day. |
| 647 : | The account is disabled. |
| 648 : | The password has expired. |
| 649 : | The account does not have Remote Access permission. |
| 650 : | The Remote Access server is not responding. |
| 651 : | 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 "" macro was not found in the device .INF file section. – |
| 656 : | The "" 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 : | There is no answer. |
| 679 : | Cannot detect carrier. |
| 680 : | 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 maxconnectiontbps. |
| 686 : | Error writing maxcarrierbps. |
| 687 : | Error writing usage error |
| 688 : | Error writing defaultoff. |
| 690 : | Error empty INI file. |
| 691 : | 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. |