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An Attempt by process 'taskhostw.exe' to modify a backup file was blocked.

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Beginner
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This keeps popping up every once in a while. Not sure how to stop it or what it means with the options to "Ignore" or "Allow for One Hour". It is referring to the file that my full backup is in.

I would appreciate any explanations.

thanks

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Forum Moderator
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Comments: 5432

#1

Hello Gary,

Thank you for your posting! Most probably, some application is attempting to modify the backup archive. Are you using a third-party apps for synchronization that might try to access the backup location? An anti-virus software that performs a regular check? 

In reply to by Ekaterina

Beginner
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Comments: 3

#2

Hi Ekaterina,

I am only using Windows Defender and Virus that is a part of Windows 10.

Windows File History does write to a separate file folder on the same NAS that my Acronis Backup is written to, but they write to different files..

I have tried to make the C:\windows\system32\taskhostw.exe trusted on the Whitelist, however to do this you have to be in the Acronis Backup program and it claims the file cannot be found. However, when I search for it from Windows File Explorer I have no trouble finding the file.

It does not appear that if I click to "Ignore" or "Allow for one hour" that it affects anything. And in order to get rid of the warning screen, you have to select one of the two options.

It just seems to be more of a nuisance. 

Most appreciative for any suggestions.

thanks,

Gary

 

Beginner
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#3

Any update on this issue? The popup has started appearing on my Windows 10 PC recently. I am not aware of any change that might have led to its sudden appearance. It is extremely annoying.

Forum Moderator
Posts: 147
Comments: 5432

#4

Hello Steven,

The real taskhostw.exe file is a safe Microsoft Windows system process called "Host Process for Windows Tasks". However, authors of malicious programs such as viruses, worms, and trojans deliberately call processes the same name to avoid detection. To make sure that running taskhostw.exe on your computer is not a malicious process, run the antivisrus scan and if no issues found, add the process to the whitelist per instructions in https://kb.acronis.com/content/60193