Pix 515 , ping to DMZ works ! ssh doesnt

Hi,i have Cisco pix 515,with some cong. like:interface Ethernet0 nameif outside 
security-level 0 ip address xx.xx.xx.6 255.255.255.240!interface Ethernet1 
nameif inside security-level 100 ip address 10.2.150.1 255.255.255.0!interface 
Ethernet2 nameif dmz security-level 50 ip address 10.2.151.1 
255.255.255.0access-list outside-acl extended permit icmp any anyaccess-list 
outside-acl extended permit gre any anyaccess-list outside-acl extended permit 
tcp any eq pptp anyaccess-list outside-acl extended permit tcp any any eq 
pptpaccess-list outside-acl extended permit tcp any host xx.xx.xx.6 eq 
sshaccess-list outside-acl extended permit tcp any host xx.xx.xx.6 eq 
wwwaccess-list outside-acl extended permit tcp any host xx.xx.xx.6 eq ftpglobal 
(outside) 1 xx.xx.x.7global (dmz) 1 interfaceroute outside 0.0.0.0 0.0.0.0 
xx.xx.xx.8 
1*****************************************************************connection to 
outside is workingping to a machine in the DMZ is workingssh to that machine in 
the DMZ machine is not working, and  i would like to  know where to start  
working on itthanks for your helpregards 
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