GridServer 6.3.1 Hotfix8 has been released. Here are the release notes:
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Introduction
  
Hotfixes are cumulative.
  
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Affected Components for 6.3.1_hotfix08
  
The following components are updated by this hotfix:
  
C++ Specific
Java Specific
Web Services
Tomcat
 
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Closed Issues in 6.3.1_hotfix08 (This Release)
 
C++ Specific
GS-18324 
A thread crashes inside the Linux while migrating from Windows libraries to Unix.
The operating system is RHEL 8.8.  
 
GS-18295
While installing the GridServer as a Service, the DISPLAYNAME is not set correctly when the DESCRIPTION contains '!'.
 
Web Services
GS-18410
An error occurs while calling getBrokerInfo() and getAllBrokerInfo() API methods of Broker Admin from Python SOAP client script.
 
Java Specific
GS-18460
GridServer version 6.3.1 supports JDK 1.8.0.401.
 
Java Specific
GS-18463
GridServer version 6.3.1 supports JDK 11.0.22. 
 
Tomcat
GS-18526
Apache Tomcat is upgraded to version 9.0.88.
 
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To download this hotfix, login to the Support Portal and navigate to Downloads > Hotfixes > AvailableDownloads > DataSynapse > GridServer > 6.3.1.