GridServer 6.3.1 Hotfix4 has been released. Here are the release notes:
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Affected Components for 6.3.1_hotfix04

The following components are updated by this hotfix:

Admin Interface
C++ Specific
Engine
Manager
Operating Systems
Tomcat

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Closed Issues in 6.3.1_hotfix04 (This Release)

Admin Interface
GS-15288
Fixed an incorrect error message that would sometimes appear in the Administration Tool UI when a Service discriminator was created with the SOAP API.


C++ Specific
GS-14642
Re-compiled and re-linked the C++ zlib 1.2.11 DLLs on Windows without inline assembly due to the library having a buggy implementation with its inline assembler code.


Engine
GS-16789
Updated the Engine JRE version to 1.8.0_271.


Manager
GS-16558
Fixed an issue where LDAP user credentials were sometimes logged in clear text.


Operating Systems
GS-15627
Windows Server 2019 is now a supported platform.


Tomcat
GS-15965
Fixed a linking issue with the Tomcat Native Library (tcnative).

GS-16849
Apache Tomcat has been updated to version 8.5.61.

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To download this hotfix, login to the Support Portal and navigate to Downloads > Hotfixes > AvailableDownloads > DataSynapse > GridServer > 6.3.1.

GridServer 6.3.1 Hotfix4 Release Announcement