Why can I not connect to a shared folder?

[CAG84]

We have a Windows 10 Pro peer-to-peer ethernet network. All computers have static ip addresses. I have configured Norton to allow those ips as trusted devices. Our internet provider just replaced our router. Now only 1 computer will connect to the software on the main computer. I 'see' all of the computers under Network but when I try to use the shortcut to a folder on the main computer, it says I don't have permission to connect. Nothing changed but the router. Any thoughts? Thanks!

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