Qlik Rest Connector cannot make connection from Windows server 2016

[Sonja_Bauernfeind]

A REST data source connection fails when using the Qlik REST Connector from Windows Server 2016.

The error displayed is:

Connection failed: Failed to connect to server

The same connection works from other REST client e.g. Postman. 

Environment:

Qlik REST Connector 

 

By default in the Windows Server 2016, only the Message Authentication SHA256 is enable and SHA is disabled. The REST connector is using "stunnel", which is the SSL/TLS tunneling framework available from Windows. 

But if the REST data service provides the Cipher suites based on TLS 1.0/1.1, which does not support SHA256, the connection is failed. 

Resolution:

The issue can be solved by enabling HKEY_LOCAL_MACHINE>>SYSTEM>>CurrentControlSet>>Control>>SecurityProviders>>SCHANNEL>>HASHES>>SHA in the registry.

Value Name	Enabled
Value Type	REG_DWORD
Enabled Value	4294967295
Disabled Value	0