Can anyone provide me a reason why this lead didn't sync to Salesforce properly. Attached is a screenshot of the lead activity in Marketo. The lead filled out a form, and did not properly sync over to SFDC.

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Re: What does this error mean: Failed: Empty reply from server

I just had the same thing happen to me, totally random. All required fields were present, no other issues. I just manually forced the sync and it worked. Weird.