NPRINTING ERROR CEF RENDERING EXCEPTION Cipher Issue

Sonja_Bauernfeind — Thu, 15 Jul 2021 22:45:26 GMT

Description

NPrinting reports fail to render when images are included
Note: NP Engine and NP scheduler may also be in an non functional state

Environment

Resolution

Diagnosis:

Check for the following error in the following log file "nprinting_engine_cef.log"
"RabbitMq server is not connected - trying diagnoser queue creation again in 10 seconds".

"Error in connection establishment: net::ERR_CONNECTION_CLOSED"

Search the windows system event logs for SChannel errors first on the NPrinting Server and NPrinting Engine computers then also on the Qlik Sense server
If you see either or both of these, please proceed to the resolution below

Solution:

Engage with the customer or partner IT department
Ensure TLS 1.2 is enabled on the NPrinting and or Qlik Sense Server. This is a requirement:
- https://help.qlik.com/en-US/nprinting/Content/NPrinting/DeployingQVNprinting/System-requirements_engine.htm#anchor-1
- Platform security: TLS 1.2 must be enabled.

Recommend Using IISCrypto (or customer's own preferred method) to check for TLS 1.2 and enabled or missing ciphers

https://www.nartac.com/Downloads/IISCrypto/IISCrypto.exe),
Ensure that these cipher suites below are enabled on NPrinting machines. If they do not appear, then they must be added:

TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
TLS_RSA_WITH_AES_256_GCM_SHA384
TLS_RSA_WITH_AES_128_GCM_SHA256
TLS_RSA_WITH_AES_256_CBC_SHA
TLS_RSA_WITH_AES_128_CBC_SHA

Minimum cipher requirements on the Qlik Sense server machines which NPrinting connects to:

TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA

Cause

Minimum Cipher requirements and or TLS requirements are not met for the version of NPrinting current running
There is NOT at least one common cipher on the NPrinting and Qlik Sense server

article NPRINTING ERROR CEF RENDERING EXCEPTION Cipher Issue in Official Support Articles

NPRINTING ERROR CEF RENDERING EXCEPTION Cipher Issue

Description

Environment

Resolution

Cause

Related Information: