Install CRM on three tier architecture

Dear All : 

Please note that i tried to install CRM in tier Architecture , front End in DMS Zone , Backend in internal Zone , SQL servers in DB zone 

i tried to install the front end service on the front end servers but it's required to access the SQL server thought port 1433 & 1434 and the install could not be completed without this connectivity 

is there anyway to install the CRM on the front end servers using the connection between the front end and backend only without the need to connect the front end server with the  SQL server 

Please advice