check is there a executive permission on that command or use ldd
<command>

I think you alter that my modifying MaxServerProcess in httpd.conf file

Please check that you have defined 192.168.0. network in the config file and you are tryig to resolve 192.168.70.1 which is not configured .

You change the line

zone "0.168.192.in-addr.arpa" {
type master;
notify no;
allow-query { any; };
file "192.168.0.zone";
};

to

zone "70.168.192.in-addr.arpa" {
type master;
notify no;
allow-query { any; };
file "192.168.70.zone";
};

and the subnet-mask to 255.255.255.0 in dhcpd.conf

It Should work Perfectly