WFE Server are not showing under "Servers in Farm"

Hi,

I have 4 servers, one wfe,two app and one db server.recently i found my WFE server is not listed under "Servers in Farm"   but portal is running fine."Servers in Farm"    i can find only two app and one DB server.

Please help to me ,how to add without effecting on production environment portal.

May be its happen because of recently we had make clone of wfe server on different location for development environment before one week,we do disconnect farm and then connect new db server for development environment.

Hasan Jamal Siddiqui(MCTS,MCPD,ITIL@V3),Sharepoint and EPM Consultant,TCS

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