I have the error "AX Attempted to read or write protected memory. This is often an indication that other memory is corrupt."

Hi.

We have a web service developed in Visual Basic .Net, 2008.

The service is installed in IIS7 (Win 2008). The website is configured to use the business connector in the app pool. Ax 2009 has the  business connector proxy user configured in the system accounts.

The web service invoke a static function of AX. The function has a parameter of type string. This string is in XML format . When the string is short works fine, but when the string is long (more than 50 characters) fails and the result is the following:

AX Attempted to read or write protected memory. This is often an indication that other memory is corrupt

In Event viewer we have two events:

EventID 110

Source: Dynamics .NET Business Connector 5.0

Attempt to clear pointerMap when it still contains objects

And

EventID 110

Source: Dynamics .NET Business Connector 5.0

Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

at BCLogon(LOGON_INFO* , SesPblk_t** , Char** )

at Microsoft.Dynamics.BusinessConnectorNet.Axapta.Logon(BC_PROXY_ACCOUNT_INFO* pBCProxyAccountInfo, String company, String

If the function is executed in AX with the same information the result is OK.

What could it be?

Thank you.