I own a personal license of CATIA v5. A recent Windows 7 update broke CATIA. Here’s how I fixed it:

• Open regedit
• Create “HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\KeyExchangeAlgorithms\Diffie-Hellman”
• New DWORD Value.
• DWORD “ClientMinKeyBitLength”
• Right-click Modify ClientMinKeyBitLength
• Value “00000200” (Hex value)

[Update Feb 2019]

On Windows 10 machines, the default TLS/Schannel cipher is not enabled. When running “DSCheckLS.exe” the license server status will be “NOT RUNNING”.

To fix this, you will need to enable a specific cipher. In an administrator’s powershell, type: Enable-TlsCipherSuite -Name “TLS_DHE_DSS_WITH_AES_128_CBC_SHA”

This is not at all obvious.

[Personal Setup]

• Add C:\ProgramData\DassaultSystemes\Licenses\DSLicSrv.txt
• Occlusion culling
• Turn off Tablet support: Transformation Pad & Gesture Pad
• Assembly Design Update Automatic