NetSuite’s concurrency limits let you allocate a part of your account’s concurrent request limits to specific integrations. An account has limitations to the number of times requests can be made to the web services and RESTlet.
You can monitor your concurrency limit usage from the Concurrency Monitor.
If you see Failed status for the NetSuite integration, NetSuite indicates that the concurrency limit for the integration may need to be adjusted. The Failed status for the NetSuite Connector integration does not always mean that the integration is not working. The status merely indicates that the request made at that specific time had failed and NetSuite Connector keeps trying until a Finished status is received. The process of trying applies to only NetSuite Connector integration, other integrations may not do the same and may stop at the first Failed status. In that case, contact NetSuite Customer Support.
By default, NetSuite Connector limits the concurrent sessions it uses to five. To change this limit, contact NetSuite Customer Support.