Qlik Sense: "Data Profiling connection failed. Refresh your browser" in Add Data interface

[Andre_Sostizzo]

Errors "Data Profiling connection failed. Refresh your browser" and "Cannot Connect To On-Demand App Service" are displayed when opening any app in hub or when trying to add data in the hub. 

• Applying Connection to the Qlik Sense engine failed for unspecified reasons randomly on the hub does not resolve the issue. 
• The On Demand service is not used, and enabling it doesn't solve the issue.

Other possible symptoms: 

• Logs are not updated or being generated 

Environment:

Qlik Sense Enterprise on Windows 

The Service Account does not have sufficient permissions on local server even though it might be member of local Administrators Group.

Resolution:

Port availability

Verify that port 4949 is open between the Engine node and the Proxy node as stated in the documentation. See  Ports - Qlik Sense for administrators and select your respective version for details. 

Also, on the Central Node firewall INBOUND rule ensure that these TCP ports are set to open (across domain/private/public). Note: Please check updated list via link mentioned above.
80,443,4242,4239,4244,4243,4432,4444,4570,4545,4747,4748,4899,5050,5151,5252,4899,8088,4900,3003,4555,4949,9028,9031,9032,9079,9090,9098,9041,9080,9041,9051,21060,5928,5929

Service Account permissions 

Verify that the service account has sufficient permissions(read/write/create) to local server.
Note! Being local Administrator does not necessarily have these permissions granted.

Set permissions on each log folder and verify permissions using the Service Account (service account must be in administrators group)

Right click on the folder -> Properties -> Security Tab -> Advanced -> Bottom Left select (change permissions/enable inheritance) -> Check "Replace all child object permission entries from this object" -> Apply

• C:\Program Files\Common Files\ Right-Click on Qlik folder
• C:\Program Files\ Right-Click on Qlik folder
• C:\ProgramData\ Right-Click on Qlik folder
• \\QlikShareFolder  Right-Click on QlikShare folder

Recreate the log folder

1. Stop all Qlik Sense services
2. rename the C:\ProgramData\Qlik\Sense\Log into C:\ProgramData\Qlik\Sense\Log_old
3. restart the services

Product Defect

Defect QLIK-98898 caused a similiar error prior to June 2020 releases. Upgrade to June 2020 or later.