Replication Failure: The reason is: Logon failure: unknown username or bad password

Basically, my domain is just filling up with this specific error (and a few others) everywhere:

Active directory replication monitor (Replication Failure: The reason is: Logon failure: unknown username or bad password)

when transferring the schema role:
the transfer of the operations master role cannot be performed because: The requested FSMO operation failed. The current FSMO holder could not be contacted

Application Event log (eventID: 1000, Userenv, Windows cannot determine the user or computer name. return value (1326))

and when i do a "netstat -n" in a command prompt i get:
TCP    192.168.1.43:4648      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4649      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4823      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4824      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4828      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4829      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4836      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4837      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4838      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4839      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4869      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4870      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4872      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4873      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4874      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4875      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4887      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4888      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4918      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4919      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4927      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4928      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4929      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4930      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4931      192.168.1.43:389       CLOSE_WAIT
TCP    192.168.1.43:4932      192.168.1.43:389       CLOSE_WAIT

I have a feeling some of them are not related problems.

NTDS general , Event ID: 1126, Unable to establish connection with global catalog

another piece of information that may be useful: the last successful replication occurred back in february, and it is now July!!

I've tried many things, i found some posts saying it was their backup, or user logged on, or something that doesn't make sense.

OMG Please  somebody Help!