How to resolve Salesforce too many requests waiting for connections

How to resolve Salesforce too many requests waiting for connections Why am I getting a SERVER_UNAVAILABLE error message when sending a request to Salesforce? Many salesforce customers are complaining about this error , so if you have this error  : com.salesforce.soap.partner.UnexpectedErrorFault: SERVER_UNAVAILABLE: Too many requests waiting for connections or an error similar to Exception in component tSalesforceConnection_1 […]