How to Fix Error Message "detected incorrect data from server" during Pulse Security Application Launcher (PSAL) Launch?
This article explains how to fix the error message 'Detected incorrect data from server' that appears during Pulse Security Application Launcher (PSAL) launch.
Problem or Goal
Cause
This error message is triggered when the device certificate installed on the PCS does not match the certificate produced by the client browser which ends on cert hash validation failure.
The client debug log should match below snippet
00181,09 2020/03/31 01:56:13.182 3 User PulseApplicationLauncher.exe PSAL p6724 t1A24 winapplauncher.cpp:550 - 'Psal::WinAppLauncher' Got response from server. WinAppLauncher::onVerifyCert 00198,09 2020/03/31 01:56:26.944 1 User PulseApplicationLauncher.exe PSAL p6724 t1A24 winapplauncher.cpp:595 - 'Psal::WinAppLauncher' Cert-hash from browser is not matching with actual hash 00151,09 2020/03/31 01:56:26.944 1 User PulseApplicationLauncher.exe PSAL p6724 t1A24 DSSSLSock.cpp:2443 - 'dsssl' Error 0x186a5 verifying server certificate 00173,09 2020/03/31 01:56:26.944 1 User PulseApplicationLauncher.exe PSAL p6724 t1A24 winapplauncher.cpp:533 - 'Psal::WinAppLauncher' Unable to make a secure connection with server 00136,09 2020/03/31 01:56:26.944 3 User PulseApplicationLauncher.exe PSAL p6724 t1A24 psal.cpp:322 - 'Psal' Unable to verify server certificate
Solution
To fix this issue, follow the below steps:
Check if Proxy server, load balancer or any other intermediate devices trying to push his own certificate to client browser instead of PCS original certificate
Ensure correct ports are mapped on the PCS for device certificate
