Very weird problem with my NAS

Let me briefly describe my network:

I have a TP-link Archer D5 router acting as a wireless router connected to gigaset sx763 router acting as a modem.

To the router by ethernet I have connected a Seagate Central NAS (3TB version) and a d-link powerline 308AV adapter.

If I connect my PC to the router using wifi I can access everything on the NAS and configure and do whatever I want.

If however I connect via ethernet or powerline (310 AV) I can access the internet and any usb attached to the router but I can't access the NAS.

The error I get is: The specified network name is not available.

Central uses a static IP outside of the dhcp range and responds to a ping using wifi and ethernet.

I have tried 4PC's using xp,vista and windows 7 (32 and 64 bit) but it can't be seen via android (on powerline) or wdtv.

I would really appreciate any help/advice as I really tried hard and would hate to leave it not working.

Any ideas would be appreciated.
Thank you very much.

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Can be true.

Many routers have firewalls even for the LAN. Since a router's NAT system is a natural firewall to the internet you have to ponder why folk turn on a firewall to their LAN. Your choice. Here I turned off my Archer's firewall.

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Thank you for your reply

Would you elaborate a bit on what is your idea?

I believe I tried the setup with firewall disabled, I will do so now again. I don't really know much about this but I was under impression that the firewall only blocks "external" stuff, I have seen a recommendation to turn it off and tried that way to no avail.

About NAT, you mean Network attached time? I turned that off as it was causing the seagate to boot up 5 minutes after it finally went to stand by, some stupid glitch they had.

Also the folders on the seagate say they are windows server 4.9, while I was under impression central is linux based, (also related to that NAT problem I had (and still have to a lesser extent))

Finally I have recently noticed that while I can't access the drive from explorer a P2P connection seemed to get through, uTorrent was able to download a file to central while my laptop was connected via powerline (so via ethernet).

I am really confused with this and I would be eternally greatful to anyone who might help.

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Sorry no.

It's a setting you must choose. As to NAT, that's a function in all consumer routers today. I would have to write a book to detail how it works so let's keep it simple. A setting you can try.

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