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Is there a limit on the number of concurrent users using a share folder ?

if yes how can i increase or decrease it ?

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From here:

Based on the research, the configuration of share folders is stored in the following registry key on the file server:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Shares To detect the maximum user connection number, we can open the subkey which names as the share folder’s name in that node. Technically speaking, we may find the value of MaxUses, which shows the maximum number that users can connect to.

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However, the actual user's upper limit of the concurrent connection number depends on the CAL number that you have.

So, theoretically, it's only limited by the number of CALS you've purchased.

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