Current driver versions:

COM Port Redirector Legacy

Com-Servers, LAN-Modems, Soft-Links under Windows NT/2000/XP/7/8/8.1/10/11 incl. 64-bit- and Server-Editions

More links

Connect a Com-Server, a LAN modem or a Web-IO with serial interface to the network, establish a virtual COM port on your system and your serial application is network-capable; without having to program a single line of code.

Win 10 function update 1903 deletes core drivers for COM Port Redirector

After an update of Win10 to version 1903 the core drivers for the COM Port Redirector legacy are no longer there. An error message only appears when the configuration tool for the COM Port Redirector is started or an application attempts to open a virtual COM port.

Solution: Perform a repair installation or update to the available current version. Alternatively as administrator switch in an input prompt to the installation directory of the COM Port Redirector (... Program Files (x86)/W&T VirtualComm) and there start "Setup.exe /install".

Date	Changes and comments	Revision
February 8, 2024	Security fix: Unquoted ImagePath in the registry corrected (VDE-2024-018) New: Logging can be completely disabled	3.94 EXE download (approx. 3.91 MB)
March 14, 2022	Corrected handling of the TCP send buffer for serial data Individually available Windows access rights for the configuration file Optical corrections in the configuration tool Elimination of support for Windows Vista and Server 2008 (since Version 3.92)	3.93 EXE download (approx. 3.85 MB)
October 19, 2021	NEW: Optional encryption of network connections per TLS-PSK for Com-Server models 58665, 58662, 58664, 58669 having firmware version 1.54 or higher Elimination of support for Windows Vista and Server 2008 beginning with this version	3.92 EXE download (approx. 3.81 MB)
July 22, 2019	Corrected error message and automatic repair after update to Win10 Build 1903	3.91 EXE download (approx. 3.56 MB)
July 9, 2019	NEW: Filters for outside line in dial string for virtual modem ports Manual expanded	3.90 EXE download (approx. 3.56 MB)
April 18, 2019	Optimizing of the Config Tool Connection opening of encrypted modem ports corrected	3.89 ZIP download (approx. 3.11 MB)
April 5, 2018	Installation problem on unpatched Win7 systems fixed	3.88 EXE download (approx. 3.57 MB)
August 30, 2017	Attestation signing (fixes problems with current Win 10 versions in conjunction with Secure Boot)	3.86 EXE download (approx. 3.53 MB)
August 9, 2017	Optimizations for the Portmap tool	3.85 EXE - approx. 3.49MB [on request]
January 3, 2017	Optimizing of failed reconnects when there is simultaneous data sending SHA256 signature for the installation exe Cosmetic corrections for the version information details	3.84 EXE - approx. 3.52MB [on request]
October 26, 2016	Optimizations for virtual modem ports and Soft-Link Cosmetic corrections in Config tool	3.83 EXE - approx. 3.47MB [on request]
June 13, 2016	NEW: SSL/TLS encrypted connections to AT modem emulators with firmware version >= 1.38 Optimized connection handling for NAT connected virtual machines Firewall-optimized reconnect after connection interruptions Optimized name resolution	3.80 EXE - approx. 3.47MB [on request]
July 24, 2015	Port management in configuration tool corrected (deleting, creating, applying) Modem ports: ati replies configurable	3.73 EXE - approx. 2.89MB [on request]
January 5, 2015	Installation optimized Configuration tool optimized (Start now possible for example without Admin rights) Corrections/additions to the optional tools Companion and Portmap	3.71 EXE - approx. 2.89MB [on request]
June 30, 2014	Serial API: Event handling revised/corrected Optional baud rate-dependent write delay corrected Cosmetic corrections in Config tool and Companion	3.62 EXE - approx. 2.09MB [on request]
April 30, 2014	32-bit core driver signed (Vista Secure Boot) New setup as *.exe with language option DNS resolution improved	3.60 EXE - approx. 2.08MB [on request]
February 10, 2014	Logging problem fixed Support for the freely configurable baud rate divisor of the Com-Server Installation problem under Win NT fixed	3.53 MSI - approx. 1.44MB [on request]
September 12, 2013	Saving of changed setting corrected Display of the application that opens a COM port in Portmap Portmap installation optimized Context help revised	3.51 MSI - approx. 1.41MB [on request]
November 22, 2012	Since v. 3.40 existing installation problem on computers without COM ports eliminated New: WMI support DNS client optimized	3.50 MSI - approx. 1.4MB [on request]
August 8, 2012	Expanded registration of virtual COM ports Configuration file output improved Renumbering of virtual COM ports optimized "Read device name" feature corrected	3.40 MSI - approx. 1.4MB [on request]
September 27, 2011	Combined installation package (German, English, 32-bit, 64-bit) *msi download format Renumbering of COM ports when there is a collision optimized	3.30 MSI - approx. 1.3MB [on request]
July 8, 2011	Renumbering of COM ports optimized Portmap can uninstall COM ports	3.24 ZIP - approx. 833 kB [on request]
May 20, 2011	LAN modem ports connection opening under Windows 7 optimized File selection boxes function under Windows NT	3.23 ZIP - approx. 818 kB [on request]
February 28, 2011	New option: Opening COM ports possible even when a Com-Server cannot be reached Update behavior and installation routine optimized DNS resolution improved	3.21 ZIP - approx. 814 kB [on request]
June 25, 2010	Optimized registration of virtual ports (rudimentary DeviceNode/DeviceInterface entries) Optimized DNS resolution incl. Companion tool Optional support of PURGE_TXCLEAR implemented	3.14 ZIP - approx. 731 kB [on request]
June 5, 2009	Online help for modem ports expanded Loading of the LAN modem configuration corrected	3.10 ZIP - approx. 717 kB [on request]
May 11, 2009	Installation/uninstallation under NT optimized Cosmetic changes to the configuration tool Problems with non-delayed COM-Open loops in connection with missing network connection resolved	3.08 ZIP - approx. 714 kB [on request]
March 19, 2009	Installation problems under Win NT eliminated Companion tool integrated into installation package	3.04 ZIP - approx. 702 kB [on request]
November 26, 2008	NEW: Configuration tools as standard application NEW: Expanded Tool Portmap.exe (opening COM ports) Change in asymmetrical Xon/Xoff protocol (fInx =! fOutx) Optimizing for operation with security software Optimized installation routine After installing Version 3.02 the configuration tool for the COM Port Redirector is no longer in the Control Panel, but rather in the Windows Start menu in the program groupW&T COM Port Redirector. As part of the installation it is possible to create a corresponding desktop icon.	3.02 ZIP - approx. 562 kB [on request]
May 19, 2008	NEU: Installation per MSI NEW: Configuration tool also in the Windows Start menu NEW: File import/export of the inventory list and settings Revised and expanded online help/manual Load-optimized control connection Optimized handling of invalid baud rates Expanded configuration tool test function Various cosmetic corrections Problem when starting the configuration tool/applet remedied	3.00 ZIP - approx. 785 kB [on request]
January 17, 2008	Optimized internal queue handling Changed control applet to Unicode	2.81 ZIP - approx. 504 kB [on request]
August 23, 2007	Deleting COM ports was not possible in Version 2.73 NEW: Numerical specification of the TCP port for supporting NAT	2.80 ZIP - approx. 501 kB [on request]
June 28, 2007	Max. length of domain names expanded Support for DHCP-assigned DNS servers Optimized error messages	2.73 ZIP - approx. 501 kB [on request]
January 25, 2007	NEW: Support for Windows Vista NEW: Freely editable comments for each COM port NEW: Dialog-free installation by running setup.exe with option /q	2.70 ZIP - approx. 474 kB [on request]
October 19, 2006	Optimized reconnect behavior for interrupted network connections Default parity changed from Even to No TCP keepalive for data port activated	2.64 ZIP - approx. 469 kB [on request]
March 28, 2006	NEW: Support for 64-bit Windows systems Cosmetic changes to control applet Internal adjustments to the LAN modem ports	2.62 ZIP - approx. 468 kB [on request]
February 14, 2006	Optimized timing and handling of the connections under Windows 2000/XP/2003	2.61 ZIP - approx. 296 kB [on request]
January 4, 2006	Internal modifications for operating on multi-processor systems Renumbering of COM ports without having to restart the computer under XP/2003 optimized Conflict checking of the control applet revised	2.60 ZIP - approx. 296 kB [on request]
December 6, 2005	Problem in restoring the connection to the COM-Server remedied Cosmetic corrections in Setup and Control Applet	2.54 ZIP - approx. 296 kB [on request]
October 5, 2005	NEW: DNS Support; target devices can now be specified by their host name Control of the Control applet optimized Error handling for MDL allocation corrected	2.53 ZIP - approx. 296 kB [on request]
April 5, 2005	Closing of the TCP connection to the Com-Server corrected Interaction with antivirus software optimized	2.50 ZIP - approx. 291 kB [on request]
December 13, 2004	Optimized utilization of the send and receive buffers Recommended value range for connect timeout extended	2.49 ZIP - approx. 287 kB [on request]
April 17, 2004	Optimized handling of repeated calls to SetCommMask()	2.47 ZIP - approx. 287 kB [on request]
April 26, 2004	Additional function: The status of RI and DCD can be determined manually or as a copy of CTS / DSR Optimizations when operating with soft links and in combination with the companion tool as well as the Windows printer spooler Optical corrections	2.46 ZIP - approx. 287 kB [on request]
December 17, 2003	Additional option: "Discard transmitted data in the case of connection disorders" Process for status queries optimized	2.43 ZIP - approx. 273 kB [on request]
October 7, 2003	Improved diagnostics messages when renumbering ports Optimizations together with W&T Companion Tool Addition of 110 baud (only when used with Highspeed Com- Servers firmware version 1.35 and higher)	2.41 ZIP - approx. 267 kB [on request]
June 24, 2003	Takes into account COM ports which are unused but reserved by other programs (e.g., USB interfaces) in Windows 2000 Visual corrections of the control applet	2.40 ZIP - approx. 265 kB [on request]
February 3, 2003	Event handling of the modem ports and soft-links Optimized Some visual changes to the control applet Registry configuration expanded	2.34 ZIP - approx. 274 kB [on request]
October 23, 2002	Packet handling of the control connection optimized	2.31 ZIP - approx. 271 kB [on request]
August 27, 2002	System password support for connections with Com-Server Highspeed added	2.30 ZIP - approx. 271 kB [on request]
May 14, 2002	Modified handling of event_char (affects e.g. problems when accessing the dialup network)	2.25 ZIP - approx. 678 kB [on request]
March 21, 2002	Corrected counter for queued send-data (affects problems when accessing Simatic S7 with Step7)	2.24 ZIP - approx. 672 kB [on request]
January 10, 2002	Optimized performance for Soft-Links	2.23 ZIP - approx. 671 kB [on request]
December 14, 2001	Visual corrections in control applet	2.22 ZIP - approx. 135 kB [on request]
December 12, 2001	Additional functions: LAN-Modem calls can be received Computer-computer couplings (= Soft-Links) are possible	2.21 ZIP - approx. 135 kB [on request]
August 27, 2001	Network side licensing test eliminated	2.20 ZIP - approx. 202 kB [on request]
July 6, 2001	COM Port Redirector for Windows NT/2000	2.11 ZIP - approx. 124 kB [on request]