+ Start a Discussion
Chad RitchieChad Ritchie 

DataLoader 400 Error

API User in our Org loads 100,000+ records 4 times per day. On 11/30 it just stopped working. They're receiving a client-side 400 error. The only changes that we made on our end were enabling XSS Protection and changing the session timeout from 1 hour to 15 minutes. Nothing else. Does anyone have any idea what might be causing this? I can see they're still successfully logging in every morning, but the loads are no longer working. I just changed the timeout back to an hour to see if that fixes it. Thanks! 
ShirishaShirisha (Salesforce Developers) 
Hi Chad,

400 error code defines the request couldn’t be understood, usually because the JSON or XML body contains an error.
if there is any date part in your JSON  for request and response. 
Check your data passing for your request and response.

Kindly mark it as best answer if it helps so that it can help others in the future.

Warm Regards,
Shirisha Pathuri