I have had a OFX Error 16503 for the past 6 days. It was fine before then. After looking at the Quicken Community for the Quicken for Mac, I found a post that suggested I call Vanguard with this error. I indeed called Vanguard and asked to speak to their online 3rd party connection expert and they suggested unconnect and reconnect to Quicken which I had already tried prior to calling Vanguard. Once disconnected I could not reconnect my Quicken data to Vanguard due to an OFX 16503 error. I had fortunately backed up my data file prior to disconnecting it. So I restored my data file. He said then that I should contact Quicken for Mac for help because he indicated the problem could be from Quicken's end. Help?
[Edited - Readability]