Replication error after promoting new AD2008

in office have 2 domain controller , offshore office have 1 domain controller. totally have 3 domain controllers in network single domain.

all domain controllers running in win2000.

in office domain controller name ad1 &  ad2

offshore office domain controller name is  oad3

ad1 having schema master, domain naming master, rid master , infrastructure master roles.

ad2 having pdc emulator role.

we planned upgrade win2008 ad in domain. installed new server win2008.

as per prerequisites done adprep/forestprep , adprep/domianprep in ad1 server. after created new win2008ad(ad4)in domain.

now facing replication errors in domain. ad1 not getting replication to/from other domain controllers.

when trying force replication through ad sites , services, getting following error.

"the following error occured during attempt synchronise domain cotroller. naming context in process of being removed or not replicated specified error"

i unable transfer fsmo roles also.

please provide solutions this.

please check basic connectivity between machines ,are able open shares of domain controllers ?

please check dns settings if pointing valid servers .

run repadmin /syncall /epaqd on server , check message getting on server .

if can ping without issues , shares comes fine try ping machine -f -l 1472 , check if packets getting dropped  .ex-  ping ad1 -f -l 1472

let know result .

thanks .

Windows Server  >  Directory Services