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When connecting to a server using the DRDA protocol, is it true that the first Client-To-Server command MUST be EXCSAT chained with ACCSEC?

I found 2 different answers when I googled it.

If you look at The Open Group web site ( it can be understood that the answer is NO.

However, if you look at the IBM website ( you can understand the answer is YES.

So which is it?

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Someone at IBM or OpenGroup knows the answer. – Robert Harvey Nov 28 '12 at 19:23

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