K2 Workspace/K2 Management site does not load after upgrade
KBS100249
PRODUCTIssue
After upgrading K2, the K2 Management site does not load and just shows a gray box.
Symptoms
1. The Browser Developer tools indicates 500 errors:
SCRIPT1002: Syntax Error
SCRIPT5009: 'Sys' is undefined
SCRIPT5009: 'StyleHelper' is undefined
2. Disabling Bundling and PostRender got the page to load (however this is a debugging step to confirm this issue; it is recommended that these two settings are enabled):
<add key="Forms.PostRenderCombining.Enabled" value="false" />
3. Enabled Global ErrorLogging by creating a 'C:Debug' folder and replicating the issue. Generated log files contains errors similar to:
Failed to get resource: /Management/Styles/Themes/Platinum2.css?v_{versionnumber}
Exception:
Sourcode.Forms.AppFramework.AsyncException: Asynchronous operation failed ---> System.Net.Exception: The request was aborted: Could not create SSL/TLS secure channel.
This indicates that an attempt to retrieve the resources for bundling was not successful because it was not able to establish a successful HTTPS connection.
If you attempt to invoke the following PowerShell command (against the K2 site URL):
The same error would be logged:
Invoking:
Indicates that only 'Ssl3,Tls' is available. These are outdated/vulnerable protocols. TLS 1.1 and TLS 1.2 should be enabled.
Resolution
Adding and enabling the SchUseStrongCrypto registry key resolved the K2 Management site loading issue.
HKEY_LOCAL_MACHINESOFTWAREMicrosoft.NETFrameworkv4.0.30319
SchUseStrongCrypto = 1 (Type = DWord)
If you start a new Powershell session and retrieve the SecurityProtocol property for the ServicePointManager:
This should now return 'Tls,Tls11,Tls12'.
Perform an IISRESET and retest the K2 Management site afterwards.
