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An OSPF router must establish a neighbor or adjacency relationship
with another OSPF router to exchange routing information. Failure to
establish a neighbor relationship is caused by any of the following
reasons: 
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Hellos are not sent from both neighbors.
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Hello and dead interval timers are not the same.
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Interfaces are on different network types.
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Authentication passwords or keys are different.
In OSPF routing it is also important to ensure the following:
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All interfaces have the correct addresses and subnet mask.
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network area
statements have the correct wildcard masks.
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network area
statements put interfaces into the correct area.
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