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Salesforce to Salesforce operations failing due to Rate limit

We are getting the following error message but don't understand why:

The Salesforce to Salesforce operation from [Org1] to [Org2] failed because the Rate limit either in [Org1] or [Org2] was exceeded. Error Message : CODE - REQUEST_LIMIT_EXCEEDED Message - ConcurrentPerOrgLongTxn Limit exceeded.. We'll retry the operation in an hour. If more attempts are needed, they'll take place 2, 4, 8, and 16 hours after the previous retry.

We checked our API calls and both orgs are under 50%. What does this error mean and how can we prevent it?
Santosh Reddy MaddhuriSantosh Reddy Maddhuri

Hi Narador,

Category: Intermittent
1) ConcurrentPerOrgLongTxn Limit exceeded
2) TotalRequests Limit exceeded
3) ConcurrentRequest
What is Happening:
1) Concurrent request limit exceeded, likely due to inefficient trigger code.
2) Too many integrations put the org past the 24-hour rolling window.
Troubleshooting Steps:
1) Review existing triggers on the impacted objects. Potentially disable roll-up logging for one or more objects.
2) Buy more API calls from Salesforce. Potentially disable roll-up logging for one or more objects.

Above information is the excerpt from the below link

Hope this help!

Thanks & Regards,