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Error on sync: unable to retrieve contacts. (504)GATEWAY_TIMEOUT in SugarCRM

Error on sync: Unable to retrieve contacts. (504) GATEWAY_TIMEOUT 
{string=return code: 504 
, HttpErrorCode=504}

We retrieve 500 records per page so it should be fine even for a large number of records. 

The cause of this error is because the SugarCRM web server configuration has too low a timeout limit.

Please try to increase the timeout settings on your SugarCRM account.

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