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Description of problem:
Error happened when auto attach by subscription-manager-gui

Version-Release number of selected component (if applicable):
Satellite-6.2.0-RHEL-6-20161213.0
[root@ibm-z10-48 rhsm]# subscription-manager version
server type: Red Hat Subscription Management
subscription management server: 3.0.0.90-Unknown
subscription management rules: 5.15.3
subscription-manager: 1.18.7-1.el6
python-rhsm: 1.18.6-1.el6

How reproducible:
always

Steps to Reproduce:
1.Install RHEL-6.9-Server-s390x-Snapshot(RHEL-6.9-Server-s390x-20170111.0)
2.Open subscription-manager-gui.
3.Register to satellite form GUI with account:password (admin:admin)
4.After registering,click Attach button to auto attach,then an error happened as the error_dialog.png shown in the attachment. 

Actual results:
As step 4.

Expected results:
auto-attach should succeed.

Additional info:

Created attachment 1241539 [details]
the error dialog

Created attachment 1241540 [details]
the rhsm log

*** This bug has been marked as a duplicate of bug 1367672 ***