ONTAP upgrade failure due to "post-apps" phase on task "OpenSSH 8.7 Upgrade/Revert Task"

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Views:: 835

Visibility:: Public

Votes:: 1

Category:: ontap-9

Specialty:: core

Last Updated:

Applies to

ONTAP 9
ONTAP upgrade

Issue

A post-update validation fails with the error:

Status Message: The upgrade failed in the "post-apps" phase on task "OpenSSH 8.7 Upgrade/Revert Task". Contact support personnel for the upgrade repair procedure

::> cluster image show-update-progress

                                             Estimated         Elapsed
Update Phase         Status
       Duration        Duration
-------------------- ----------------- --------------- ---------------
Pre-update checks    completed                00:10:00   00:01:13
ONTAP updates        paused-on-error          05:00:00   04:34:07
Details:

Node name            Status            Status Description
-------------------- --------------- --------------------------------------
Node_name            waiting

Node_name            failed            Error: Upgrade of node <node_name> failed to 
                                       complete.

                                       Action: Use the (privilege: advanced)command 
                                       "system node upgrade-revert show -node <nodename>" 
                                       to check the upgrade status.

::> system node upgrade-revert show -node <node_name>
  (system node upgrade-revert show)

Node: Node_name
Status: failed

Status Message:  The upgrade failed in the "post-apps" phase on task 
"OpenSSH 8.7 Upgrade/Revert Task". Contact support personnel for the upgrade repair
procedure.

::*> upgrade-revert show-task-status -node *

Node         Vers Phase     ID  Proc   Status     Description
------------ ---- --------- --- ------ ---------- -----------------------------
Node_name  1800 post-apps 1818 mgwd  failed     OpenSSH 8.7 Upgrade/Revert Task

From mgwd logs we see the below error:

Sat Jul 12 2025 02:48:53 +00:00 [kern_mgwd:info:2708] 0x8366ac800: 0: ERR: MGWD::OPENSSH_UPG_REV: src/tables/openssh_upgrade_revert.cc:466:upgradeCommitRDB: modify failed for Vserver=NXXXXLKS-clust,error = Removing all SSH key exchange algorithms is not supported. SSH login would fail. There must be at least one key exchange algorithm associated with the SSH configuration.