Shake,

Output from show ip ospf interface are as folows

FastEthernet0/0 is up, line protocol is up
  Internet Address <<<loopback ip >>>, Area 0
                         ^
This isn't an unnumbered interface by any chance? Or is that just a
typo?

What about MTU on both sides? And what does the other end say?

maybe it would be easier if you could share the config.
Also off-list if you prefer. Like a sh run and a sh int
and sh ip int.

Thanks
Sascha
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