Socket programming help in c Urgent helpneeded please

Client - Server Interaction:

I am sending request to exicute a script from a client machine(solaris 8) to server machine(linux) thru my Client.c and Server.c programs. If i send one connection at a time immediately returns the output. If there more than one request or connection(ie to execute more than one script at a time).. it takes time to return the output. This problem is only in Linux Platform.. It works perfectly in Solaris Environment. I am sending both client and server program as attached.