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The first few things I'd check to give a clue as to whats wrong
1. What are the IP addresses of each PC, if your network relies on there being a DHCP server to automatically assign every PC on your network with an IP address on the same subnet, then by connecting these two directly together (and removng them form the rest of the networl - unless its wireless) you may have unwittingly removed their IP addresses
In which case you'll need to configure the network settings manually
They will usually be 192.168.#.XXX but there are a couple of other private subnetworks that can be used.
192.168..... means its a private internal subnetwork - this simply means that nobody on the internet will use that subnetwork and generally its blocked so even if should accidentally connect directly to the internet it wont actually get out.
The # is your internal subnet number, doesnt matter what it is so long as all other computers are on it that you want to talk to - could be 1 to 255
And XXX must be unique to your particular PC - XXX cannot be the same on two or more PCs that will be fatal !
For those two PCs to talk to each other they should be on the same subnetwork (or you have some non standard subnet masking !! thats likely to get very messy)
The subnet masking will be 255.255.255.0
If your two PCs have an IP addres and all but the last 3 digits are the same then at least they are on the same subnet, but you still need to check that there is actually a network connection in existence.
2.
2nd step is ping one from the other
Just proves that there is a physical, and a software network configured connection between the two PCS - if the ping is successful then its probably an issue within the settings of your VNC software
3.
The VNC connection still needs to then use the TCP/IP network connection to communicate and it does this through its own port and uses its own protocol - these are settings in the software - but I imagine the defaults should be there already and viable.
So you would also need to make sure that you have used a port that is viable - and the same on each end.
Have you configured one as a slave and one as a server - thats what I have on all my systems but Im not familiar with your VNC software - maybe it doesnt need to ?
That should get you started on the problem solving path.
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