Number of remote RFC connections to SAP from third party application

Hi All,
We are using an external application which is using the JCO API to make a connection to the SAP server to pass invoices. But the connections are note properly closed after invoking the RFCs and SAP seems to be not able to handle further requests once the numer of connections reach the maximum limit.
Could you tell whether there is a max limit on the number of connections opened to SAP from remote function calls from a third party product?
Is there anyway by which we can make sure that connections are properly closed in SAP after the each remote call?
Thanks in advance for your pointers.
Regards
Arun

Dear Arun,
Here are the parameter settings which you can do to set up RFC connections to SAP servers.
http://help.sap.com/saphelp_nw70/helpdata/en/c3/ce70a5cf0ab1499bfbf464e6e92de0/frameset.htm
This will resolve all your problems.
Thanks & Regards
Vivek

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