Steam Family Sharing – Steam Has Forgotten All Shared Libraries on the Device

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I have a shared library from my friend. I was able to play it fine until today, now it says that that it has to be authorized again on this device and asks to send a request to a friend to do that which in turn fails:
"In order to allow game sharing the owner must login to this machine…" which they already did of course some time ago. How can this problem be fixed? (Apart from asking a friend to do it again)

Best Answer

I have figured out what was the problem. I have turned off one of my network adapters. It seems that to detect the same machine is used you have to have exactly the same network adapters as you had during Family sharing installation.