PLEASE HELP Mapping error the network name is no longer available ReadyNas 2100

Please help me determine what could cause a mapping issue I am seeing with my readynas 2100. 

Info: I have an active directory system I am putting the Readynas on for a data backup to a recorder. This system is a communicaiton system for a county I am working. The system is an active directory GPO based system.

I have join the Readynas 2100 to the domain and synced it with my NTP. All is good there. The NAS has even pulled all the accounts from AD as you would expect. 

I then created a fileshare on this NAS. I can access the file share via I.E. (Internet Explorer.) I plan to use the file share I created as a location for backup of one of the machines on the domain. 

I have tried to map the network drive from a machine on the domain and encounter an error stating that this network drive name is no longer available. I cannot get past this point on any of the machines on the domain. 

Strange enough if I remote into the system with my personaly machine I can map the drive with no issue on my local PC. 

What would cause the Machines on the domain to not be allowed or get the name no longer exsist error when trying to map the fileshare?

I have tried it on many different windows platforms on the domain with no luck. I have also disable microsoft client signed messages, local security policy via AD gpo and this didnt help. 

I cannot for the life of  me find anything that could help. I cant use netgear support as the contract has been long expired. Netgear refuses to assist any furthure without buying a support contract. This isnt my equipment or my companys equipment. So the county would have to foot the bill and I would like to explorer the knowledge base on the community as was recomended to me.