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[The_Doc_Man]

It is not at all unheard-of for an Office or Windows update to reset a registry key. Given the key you name, I'd bet on an Office update, but I don't use the feature implied by that particular key. And if it was something that worked on Tuesday and failed on Wednesday, ... you should be aware that MSFT pushes updates every other Tuesday night. When I was still a working man, my office used to dread alternate Wednesdays because of the chaos from Windows and other updates. You MIGHT go to the Start >> Settings >> Windows Updates panel and look for the Update History to see if you had an Office update Tuesday night or early Wednesday morning.

If you only had one such update (sadly, unlikely... but possible), you might be able to roll it back. Otherwise, you probably would have to go back and tweak that setting again.

 

[isladogs]

@mellamokb

Just to clarify...
Are you saying that the AllowQueryRemoteTables registry key keeps being removed?
Or do you mean that its value keeps being reset from 1 to 0?

Also, whichever of those you meant, does this follow a Windows Update? Or was there an Office Update?