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Try Increasing the heap size of Admin Server.
Start the Admin Server as below
1)java -server -Xms512m -Xmx512m weblogic.Server
or follow the below link for increasing the heap size
As Fab mentioned try to increase Heap size I may suggest to make it for 1024m or else you can stick to 512m also also try to clear tmp and cache folder under %Domain_Home% / servers / AdminServer.
This will fix the problem.
Thankyou for your reply; I am using -Xms1g -Xmx4g for memory heap settings in "startWebLogic.sh" under DOMAIN_HOME/bin.
Clearing tmp & cache for AdminServer had no impact. Only the Servers link which gives configuration/list of servers & control tabs is taking too much time.
This happens when node managers are not running (or not reachable), as it tries to obtain the status of the servers that are deployed on different machines.
What you can check is; are the node managers running on the machines you have configured (in the admin console, click environment, machines, your_machine, monitoring)
NodeManagers are running & the status is "Reachable".
Thankyou all for your time & effort.
My problem has been solved. It was because of the DNS entries problems among servers. My Sys Admin fixed it.