RN424: problems when accessing via WiFi

Using 2.4GHz on the Surface Pro 4, I am able to access the NAS admin page; I went as far as the username/password login prompt but didn't actually log in.

When I try to access the shares via Windows Explorer is when the username/password violation thet I attached in a previous message is displayed.

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kmmcd wrote:

Each of the Surface Pro 4's are able to access the internet, so they have access through the router to my local network, where the DSL modem resides.

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No, one does not prove the other.  What "guest access" does is give a device access to the internet but not to other devices on the network, the condition you seem to find yourself in.  Thus, my question.

Some routers also allow you to assign a different subnet to the different frequencies.  Are all devices on the same subnet (have the same first three numbers in their IP adresses)?

A recent update in Windows is also giving me a problem, but it is independent of how I try to access the network.  I believe it is caused by having the mapped drives persistent and Windows sending my computer ID and password, where the password is different that what I use for the NAS, to the NAS at boot and then never asking me again when it finds those to be wrong.  Prior to this update, it did ask.  If your problem is related, then opening a command prompt and issuing a net use * /delete command and replying Yes to the prompt it gives should clear it up, though it will remove any drive mappings you've made.  I have a little batch file now that removes and then re-establishes all my mapped drives.