i tested a webservice request using PUT method in Postman and i inserted the certificate client into the certificate setting and now i'm trying to reproduce the same methode in neoload. i have written the same exact request in neoload but it seems that i still have a problem with the certification, here is the respond message :
<Erreur>
<Code>SSL error</Code>
<Message>No required SSL certificate was sent</Message>
<Resource>webservice</Resource>
</Erreur>
If that certificate is used to authenticate against the server you need to import it in the NeoLoad preferences under Project settings tab-->Certificate manager.
Then in that panel under Runtime area select for example "same recording" option and try again to run your request.