Rick wrote:

> But I'm only guessing. What exactly are the errors you get during these 
> intermittent SSL failure flurries?

So this is application to application SSL - no end users involved so that 
simplifies things somewhat at least as far as sw levels and algorithms involved.
The error one client application is getting is (Yes, this client is CICS)

DFHSO0123 02/24/2016 10:46:21 CICSP6JA Return code 411 received from function 
'gsk_secure_socket_init' of System SSL.
411
Message authentication code is incorrect.
Explanation:
The message authentication code (MAC) for a message is not correct. This 
indicates the message was modified during transmission.

z/OS is right next door on the same switch so it's not likely that it was 
modified during transmission.

IHS has to be recycled to recover sometimes (and sometimes it recovers on its 
own).
The volume is very high so the traces IBM needs have been next to impossible to 
collect.

Sniffers on the ports have revealed nothing unexpected either (like scanning).

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