You will want to remove the old distribution points and recreate them. It sounds like the individual who created them before you may have changed the password at some point and the old DPs did not get the chance. It's also possible the servers that are housing the DPs were rebuilt (restored) at some point. If that's the case, SMS may not be referencing the DPs correctly, and you'll need to perform a special procedure to remove the DP references before recreating them. See Removing old site systems from the SMS database.
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