Article ID: 216766
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If you have a pointer to conformant structure as a field of a complex structure under Windows NT 4.0 with Service Pack 4 (SP4), the unmarshaling side gets uninitialized data. If such a data structure is an [in] parameter, the server manager routine sees the corruption. If it is an [out] parameter the corruption, the client sees the corruption.
The same problem appears if your RPC application is running on Windows 95 with DCOM95 1.2 update or Windows 98 with DCOM98 update as documented in the following article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/216889/EN-US/ )FIX: DCOM95 1.2 or DCOM98 Causes Data Corruption in RPC Calls
A defect in the rpcrt4.dll that is shipped with Windows Service Pack 4 (DCOM95 1.2) and DCOM98 prevents the conformant part of the conformant structure to be marshaled. The unmarshaling side expects the conformant part and unmarshals from a possibly uninitialized part of the RPC buffer. This causes data corruption.
Windows NT 4.0To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update. For information on obtaining the latest service pack, please go to:
Windows NT Server 4.0, Terminal Server EditionTo resolve this problem, obtain the latest service pack for Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/152734/EN-US/ )How to Obtain the Latest Windows NT 4.0 Service Pack
Microsoft has confirmed that this is a problem in Windows NT 4.0 Service Pack 4 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4. This problem was first corrected in Windows NT version 4.0 Service Pack 5 and Windows NT Server 4.0, Terminal Server Edition Service Pack 5.