MacBook pro network problem

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Hi,
I have a MacBook pro 15" retina (mid 2012) with Sierra installed and in the past few weeks it won't connect to other computers on my network (Mac Pro 1.1 2006 and my wifes Windows computer. The other computers are showing in the finder but won't connect. The Mac Pro connects to the Windows computer with no problems.
Any ideas ?
Thank you
David
 
Joined
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Your Mac's Specs
M1 Mac Studio, 11" iPad Pro 3rd Gen, iPhone 13 Pro Max, Watch Series 7, AirPods Pro
Did any of the three devices update at some time recently?

What OS versions are the two other devices using?
 

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