Windows 10: Why can I not map to network drive anymore?

I have two 2 NAS devices I have been using for several years, mapped as Y SynologyDS420+, 16TB and Z WDEX4100, 16TB, connected via ethernet to our network. These are used as RAID backup for working files for our company from desktop USB 8TB and 16TB drives. Backup happens in real time. Right after Christmas, I came into my office and my PC had apparently restarted overnight, I presume due to a Windows Update, despite being set to notify me before installing. Microsoft, right? Anyway, after I logged in, the mapped drives no longer appeared in File Explorer. I attempted to redo the mappin

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Trouble Mapping Network Drive

I have a WD NAS drive connected to my router and have mapped it on three of my computers. I just setup another laptop with Windows 10 and have updated it to 1809 and when I tired Mapping a network drive nothing is displayed in the browse window except the
computer I am currently using. The drive is shown under network locations in File Explorer but not when you select map network drive and browse. I right clicked on the drive and selected properties and noted the IP address and went back into Map network drive
but instead of selecting browse I entered the IP address but it still does not map the drive. The strange part is if I go to any of the computers that already has the network drive mapped and select Map network drive and select browse none of those computers
show the drive either but you can select the mapped drive in the drive list in file explorer and it works just fine.

I have read several articles both here and elsewhere and tried the suggestions but nothing works. Network discovery is turned on as is file sharing and also checked if all three boxes under SMB file sharing support in Windows features were also checked and
they are. I have mapped several computers to several different drives over the years and anytime the drive was not listed it was always easy to go into Network Sharing Centre and find the problem but everything seems to be as it should so would appreciate
if someone can suggest something I may have overlooked.

Thank you

 

Mapped Drives Issues

To clarify .... the issue is the Windows 10 OS. It is with Windows File Explorer. The Mapped drives used to appear in File Explorer's left panel list of drives and folders. Two days ago File explorer stopped show the mapped drives. so not they don;t appear in the list of Drives and folders.

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I did, it has no effect. I also check the NAS devices they support SMB 2.0. Also I have several other computers on my home network they work fine with the mapped drives and They do not have SMB 1 turned on. So it is something that happened to the computer in question.

 

Connecting NAS - mapping of drives  

Ok, If you want, we can do a step by step troubleshooting of your current situation: If you are able to ping your Machine and it responds. Code:

Try to view if your NAS appears on the Network List: Code:

If Your NAS appears on the list, try to view it: Code:

The available shares will be listed there. Then Try to List the content of one of the directories: Code:

This should list the content of the directory, If all this works Try to map a drive on one share: Code:

Pls reply with the "response" of the first "encounter" of a non positive output. This exercise should reveal if you have a Network or Protocol or Cipher or Authentication problem.