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Windows 7 simultaneous connections

I have one Windows 7 Pro workstation in an office that I am having issues with mapping drives. I keep getting an error about simultaneous connections and it won't let me map a drive manually. I've created two different shares and both won't work on the one workstation. The server is a Windows 2012 R2 server hosting the data and we are not using these laptops to join the domain yet but just need to map some drives. There are already 3 other mapped drives, all of which work fine. I can't get the 4th one set up. It's as if there is some sort of restriction.
Anyone have any ideas?
2 Solutions
Cliff GaliherCommented:
Microsoft has long restricted the number of connections allowed while in a workgroup (non-domain) and while the specific number has varied based on edition (home supports less than pro) and version (it got bumped up from XP to Vista), it is still relatively small due to the amazing amount of traffic workgroup chatter creates and the performance issues that arise from such a setup.  So yes, every connection counts, from a mapped drive to a shared printer to a service running (quickbooks for example.)  It is easy to hit these limits when mapping too many drives.  That's when it's time to move to domain-joining the machine.
Fred MarshallPrincipalCommented:
We tend to support clients with peer-to-peer networks.  So, of course, in that case the file servers are running a workstation OS such as Windows 7 Pro or Windows 8.1 Pro.  The limit to the number of logged on users is 20 in both cases.

You can see the current status this way:
Right click on "computer" and select "Manage".
Under "Computer Management Local", go down to "System Tools" / "Shared Folders" / "Sessions"
There you will see the logged in users.
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