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Welcome!What Hardware version is your router? Look at sticker under router.
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Firmware version is currently loaded? Found on routers web page under status.
What region are you located?
Some things to try:Setup DHCP reserved IP addresses for all devices ON the router. Setup/Networking
Ensure devices are set to auto obtain an IP address.
Set Firewall settings to Endpoint Independent for TCP and UDP under Advanced/Firewall.
Enable uPnP and Multi-cast Streaming under Advanced/Networking.
What OS platform are you using?
What model JD box do you have?
After setting up the jetdirect box, make sure your reserving the IP address for the Jet Direct box on the router. Any new IP addresses that are assigned to the JD box, you need to make sure your printer properties reflect that the correct IP address is being used there as well on the PCs. Under the Ports tab.
I would remove any currently installed printers in windows then reinstall them.
I would also verify that your JD box is working as well, does it have a test page button by chance?