Is the old server still operational? If so, you could simply stop redirecting the old clients and use it to distribute out the new agent so they then talk directly to the new server. That should work fine providing your old server wasn't completely hosed.
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Thanks for your response. Yeah, unfortunately, the old server is no longer operational. I missed this part of the testing when I switched over since I was mainly focused on functionality of getting the internal clients switched over. (which is working pretty well) Sounds like my best option might be to just schedule a reoccurring push based method task to get the client out to em eh?