FIX: "Unable to allocate client in pool" error in NCo in BizTalk Server

Applies to: BizTalk Server 2016 DeveloperBizTalk Server 2016 EnterpriseBizTalk Server 2016 Branch More

Symptoms


When you try to send multiple iDoc documents simultaneously to SAP through the .NET Connector (NCo), you receive an error message that resembles the following:

 

 

Note This issue may occur even if you set the Enable Connection Pool option to False for the Send port.

Status


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

References


For information about the service packs and cumulative update list for BizTalk Server, click the following article number to view the article in the Microsoft Knowledge Base:

2555976 Service Pack and cumulative update list for BizTalk Server

For more information about BizTalk Server hotfixes, click the following article number to view the article in the Microsoft Knowledge Base:

2003907 Information about BizTalk hotfixes and Cumulative Update support