So here we have two problems:
VisibilityHow would I find out who is the master browser? I may not fully understand, but isn't Bonjour suppposed to advertise any host to each other? The Mac doesn't display this bad behaviour after all. In any case, all 5 devices are online and not set to sleep or turn off, so that shouldn't be an issue. And BTW this Windows 10 computer has been turned on for the past 48 hours, that's plenty of time for discovery or set a new master browser.
What I understood from your first message was that SMB1 was a deprecated protocol that is and should be disabled on every LAN device. I enabled it following these instructions, since the option was not displayed in Windows features.
Also, you can activate it using this process :
1. Click on the Start menu
2. Type cmd to find the command prompt
3. Right click on "Command Prompt"
4. Select "Run as administrator"
5. Type the following command : DISM /Online /Enable-Feature /All /FeatureName:SMB1Protocol
6. Confirm
I rebooted the computer, then enabled SMB1 on fvdw, still to no avail. It stays invisible, even though other devices do show up properly this time.
AccessibilityEven after these tweaks, when I call the fvdw NAS through its IP, the error is the exact same one: 0x80004005.
Double-clicking the Synology NAS gives a list of shared folders (correct behaviour), while the OMV NAS gives 0x80070035 error (another incorrect behaviour). :hairpull
Why is enabling SMB1 still necessary in Windows 10 even if it's less secure, slower, etc.?
How could Mac OS X got SMB sharing mostly right 8 years ago but Win 10 still struggles with its own protocol?
More fundamentally, why is fvdw the only firmware to cause issues with hostnames and still doesn't support Bonjour properly?
Network sharing nightmares was one of the reasons I left Windows 15 years ago. 15 years after, it's still not ironed out. Now I realize this is a rant, but I'd really like fvdw to become truly plug-and-play and match its stability (347 days uptime and counting, when I replaced the UPS unit.)