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NPRINTING ERROR CEF RENDERING EXCEPTION Cipher Issue

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Sonja_Bauernfeind
Digital Support
Digital Support

NPRINTING ERROR CEF RENDERING EXCEPTION Cipher Issue

Last Update:

Jul 15, 2021 6:45:26 PM

Updated By:

Frank_S

Created date:

Apr 19, 2021 7:21:42 AM

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:

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

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

 

Related Information:

 

 

 

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Version history
Last update:
‎2021-07-15 06:45 PM
Updated by: