What is ToDuCAlC.EXE?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the ToDuCAlC.EXE on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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ToDuCAlC.EXE file information

The process known as T-Online DUN Connection Alive Checker belongs to software T-Online Software or T-Online Direktanwahl by Drews EDV+Btx GmbH (

Description: ToDuCAlC.EXE is not essential for the Windows OS and causes relatively few problems. ToDuCAlC.EXE is located in a subfolder of "C:\Program Files". The file size on Windows 10/8/7/XP is 45,056 bytes. 
The program is not visible. The ToDuCAlC.EXE file is not a Windows core file. Therefore the technical security rating is 42% dangerous, however you should also read the user reviews.

Uninstalling this variant: If you want to remove the program completely, go to Control Panel ⇒ Software ⇒ T-Online Direktanwahl.

Recommended: Identify ToDuCAlC.EXE related errors

Important: Some malware camouflages itself as ToDuCAlC.EXE, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the ToDuCAlC.EXE process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

Von der T-Online Software verwendete Datei, die die Internetverbindung nach der Einwahl überprüft. Kriegt diese keine Rückmeldung (z.B. Firewall) wird die Verbindung intern (Timeout) abgebaut.

Summary: Average user rating of ToDuCAlC.EXE: based on 1 vote with 1 user comment. One user thinks ToDuCAlC.EXE is essential for Windows or an installed application.

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Best practices for resolving ToDuCAlC issues

A clean and tidy computer is the key requirement for avoiding problems with ToDuCAlC. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the ToDuCAlC.EXE process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

ToDuCAlC.EXE [all]