Working with client certificates

I’m trying to follow the advice from “Working with Certificates” tutorial. I’m not experienced with protocols so having trouble sorting out the concepts.

One step is:

Choose your client certificate key file in the KEY file field

I am not sure what the client certificate key file is. I have a JKS keystore with a self-signed certificate and a private key. I exported the certificate and also create a P12 keystore and used openssl to export a PEM file with I think the private key.

I tried plugging those into the settings | certificates “CRT File” and “KEY File” fields, leaving the “PFX File” and “Passphrase” fields blank.

When I submit my SOAP webservice request I get an error response that seems related to certificate processing as below. I would appreciate any help in understanding how to submit a webservice request with a client certificate.


Error: error:0900006e:PEM routines:OPENSSL_internal:NO_START_LINE

  • :arrow_forward:Client Certificate

:arrow_forward:Request Headers

Content-Type: text/plain

User-Agent: PostmanRuntime/7.26.5

Accept: /

Postman-Token: f49fcca4-dc5f-443e-8775-511bd7a531b9


Accept-Encoding: gzip, deflate, br

Connection: keep-alive

:arrow_forward:Request Body