Bigger dataset Received disconnect from....MAC check failed

A discussion of Co:Z sftp, a port of OpenSSH sftp for z/OS
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cagatayucuzal
Posts: 40
Joined: Thu Jun 01, 2017 9:15 am

Bigger dataset Received disconnect from....MAC check failed

Post by cagatayucuzal » Mon Dec 25, 2017 1:56 am

Sftp jobs

mainframe to->windows server



some sftp jobs get this error sometimes (bigger dataset, after an hour)

Received disconnect from x.x.x.: 5: MAC check failed

20gb-31gb

can you comment this? is there any timeout setting coz?
In my opinion ,this problem is remote host(Windows) ,how can we to sure that?

cagatayucuzal
Posts: 40
Joined: Thu Jun 01, 2017 9:15 am

Re: Bigger dataset Received disconnect from....MAC check failed

Post by cagatayucuzal » Tue Dec 26, 2017 5:52 am

is this problem realeted for this?

http://www-01.ibm.com/support/docview.w ... sg1OA51665

Regards

Cagatay

dovetail
Site Admin
Posts: 1789
Joined: Thu Jul 29, 2004 12:12 pm

Re: Bigger dataset Received disconnect from....MAC check failed

Post by dovetail » Tue Dec 26, 2017 10:47 am

The problem is either:

1) a network packet corruption problem
2) a problem on z/OS OpenSSH
3) a problem in the Windows SSH software

For (2), APAR OA51665 could be the problem, but only if you are using the specific IBM OpenSSH version and specific Cipher algorithms.
Use the APAR instructions to see if this problem applies to you.

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