IPsec not allow multiple access to fileserver

[allenkllow]

Hi,

My firewall model is Fortigate 500D and i already setup IPsec tunnel for Forticlient VPN access. If more than one user trying to access the fileserver and it will kick the previous user out. Means it is only allow one shared folder session for Forticlient users.

My server is Windows Server 2003 and event log will keep having warning message, please see below for details:

Event ID: 2012 Source: Srv

Message: While transmitting or receiving data, the server encountered a network error. Occassional errors are expected, but large amounts of these indicate a possible error in your network configuration.  The error status code is contained within the returned data (formatted as Words) and may point you towards the problem.

Are you guys having the same issue before? May i know how can solve this problem?