This issue occurs While recording the application (mostly Chrome or Firefox) the following error message appears:

''Server has a weak ephemeral Diffie-Hellman public key''

The Cause is a weak Diffie-Hellman and the LogjamAttack protection was applied in the application.
For additional information go tohttps://weakdh.org/

The Fix is:

For LR 12.50 is to apply LR 12.50 patch 3

OR

Perform the following steps:

1. Go to the LoadRunner (VuGen if VuGen Standalone installation) bin folder
2. Find and Backup the following DLLs: Api_openssl_proxy.dll and Api_openssl_proxy_x64.dll
3. Download the relevant patch according to theLoadRunner version:

LoadRunner_12_50_Diffie_Hellman.zip

LoadRunner_12_02_Diffie_Hellman.zip

LoadRunner_12_01_Diffie_Hellman.zip

LoadRunner_12_00_Diffie_Hellman.zip

4. Apply the two DLLs

The Patch is available at https://softwaresupport.hp.com/group/softwaresupport/search-result/-/facetsearch/document/KM01860986

NOTE: if using LR 11.52 you will need to update to 12.XX to fix this issue