I have written an Android app that accesses shared folders on Windows PCs 
and on my NAS drive. This has been working fine for some time now.

I've just come back from a short break and something has happened to my 
Windows 10 Laptop with the result that I can no longer connect to it from 
any of my Android devices. After repeated failures, both from my own app 
and a network-aware file manager, I reluctantly resorted to re-installing 
ES File Explorer. In ES, the icon for my laptop now has a little red dot in 
the top left corner. If I click on it, ES File Explorer reports:

    unlock SMB2.0
    The server that you want to set up requires SMB2.0. Please unlock first.

This is followed by an advert for a game I don't want and an unlock button. 
I've not tried the button in case it installs the game (these ads are the 
main reason I gave up on ES in the first place).

My laptop didn't require SMB2.0 a week ago. Can anyone suggest what might 
have changed in the interim and whether I can reverse that change at the 
laptop end?

What does unlocking SMB2.0 actually mean? I don't just want to be able to 
access the server from ES, I need to be able to access it from my own app. 
If I click the Unlock button in ES will that then enable me to access the 
laptop from all Android apps or do I need to do something to my Android app 
to enable it to access a server that "requires SMB2.0"?

Note that my desktop PC (also Windows 10) and my NAS drive aren't affected 
by this problem. I can still connect to those from my Android app.

Any advice or information gratefully received.



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