Hi @robotix​ ,

Unfortunately, the HTTPCaller cannot use a pfx cert for authentication. The authentication methods we do support are When authenticating with a username and password, the basic, digest and NTLM access authentication methods are supported: When authenticating with a username and password, the basic, digest and NTLM access authentication methods are supported:

• Basic (HTTP Basic authentication): This is the default choice, and the only method in widespread use and supported virtually everywhere. This sends the username and password over the network in plain text, easily captured by others.
• Digest (HTTP Digest authentication): Digest authentication is more secure over public networks than the Basic method.
• NTLM (HTTP NTLM authentication): NTLM is a proprietary protocol invented and used by Microsoft. It uses a challenge-response and hash concept similar to Digest to prevent the password from being eavesdropped.
• Single Sign-On

You could try posting an Idea here: https://community.safe.com/s/idea/Idea/00B4Q00000ABiEt

Ideas are our way of tracking user submitted ideas. Additionally, any context you could provide as to why this enhancement is important to you would be great.