Problem With PPPoE

Dear All,
I have RouterOS 3.20

it makes me crazy
i know how to install pppoe server and the problem is
when completing all the installation. and entering DNS and Gateway IPs
and installing Hotspot after that i am installing the pppoe server

the main problem is

the pppoe clients are connected perfectly
but they’ll get only the titles of the pages
and the ping working perfectly.

Where is the problem ???

Note : my ether1 which is the input is working on DHCP client , although i have tried to make it static and the same problem still

All the solutions i tried : changing cables , changing the server pc , changing the subnet and the ip ranges , changed the input source , changed everything .

Is there any other options on PPPoE Server to set ???

Thanks

maybe, upgrade first?.. http://wiki.mikrotik.com/wiki/Upgrading_RouterOS

Upgraded to 4.3, The same problem exists,

Tried to use another hard disk and installed 2.9.7 and the same problem still

Please give me a solution

Sounds like an MTU problem.

Yes i think so the problem in MTU

my settings are :

Max MTU : 1480
Max MRU : 1480

What should i change ??

Please help

10x in advance

Please help me

i have installed fresh copy of 4.4 and with new license and still have the same problem

Please help