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What does Invalid MAC mean?

Posted: 04/01/2008 00:03:28
by John Yu (Basic support level)
Joined: 08/10/2006
Posts: 2


I'm using SecureBlackBox 3.2.52 with Delphi. I use a TElIndySSLIOHandlerSocket in client mode to connect to a server via SSL. Once in a while, I'll get an "Invalid MAC" error from TElSecureClient.TLS1ParseOnRecordLayer(). It occurs very rarely and I have no consistent way to reproduce it.

What does the "Invalid MAC" error mean? Is there any configuration I did wrong with the SSL socket handler?

Posted: 04/01/2008 02:42:22
by Eugene Mayevski (Team)

Invalid MAC error in older versions (in 6.0 we added separate error codes for various versions) can mean many things - from the corrupted packet (i.e. the packet was modified during data exchange) to some protocol error.
This kind of problems has gone away long time ago - the code was redesigned or the issues were fixed during SBB 4 and SBB 5.

Sincerely yours
Eugene Mayevski



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