How to control nodes if DMGR is down in Websphere environment

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Usually all nodes are managed or administered through DMGR console. If the DMGR is down, is there any way to manage the clusters or application servers which are federated to the DMGR?

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You can start/stops servers locally using scripts from the PROFILE\bin folder or connect using wsadmin to nodeagent. Configuration changes are not recommended since they will be overwritten once the DMGR is back and you issue synchronization request, as the changes are flowing only from Dmgr to Nodes, not the other way around.