AT LAAST!! After 4 month, and seeing the error for the second time, I found the solution here:

https://support.microsoft.com/en-us/help/4046019

Turns out, if you type the ip in "Run", and only in "Run", a very specific error shows up that contains this message: "your organization's security policies blocks access..."

Searching that lead me to this solution:

Computer configuration\administrative templates\network\Lanman Workstation "Enable insecure guest logons"

And that solved the problem.

AT LAAST!! After 4 month, and seeing the error for the second time, I found the solution here:

https://support.microsoft.com/en-us/help/4046019

Turns out, if you type the ip in "Run", and only in "Run", a very specific error shows up that contains this message: "your organization's security policies blocks access..."

Searching that lead me to this solution:

Open "Local Group Policy Editor" by searching in Start Menu or going to Run and running gpedit.msc, then go to Computer Configuration\Administrative Templates\network\Lanman Workstation and: "Enable insecure guest logons"

And that solved the problem.