Is it possible to configure forced logged off for extension mobility users after some time say 4 hours. What parameter we need to change in eneterprise/service parameter.
Yes, configure this EM service parameters.
This is from 8.X but they look quite similar in previous versions, only you don't get the inter or intra as this only exists in 8.X and above.
Enforce Intra-cluster Maximum Login Time -> TRUE
Intra-cluster Maximum Login Time Required Field -> TIME
Inter-cluster Maximum Login Time Required Field
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