JMeter - Trouble sending HTTP request with POST variable?

Remove http:// from Server Name / IP field of your HTTP Request Sampler (that's pointed in HTTP Request fields description).

Look onto your generated POST request above in description:

POST Request
POST http://[http://sophos1.testserver.co.uk/servlet/archive]:61061/

Configure your HTTP Request as the following instead:

Server Name: sophos1.testserver.co.uk
Path: /servlet/archive
Implementation: Java

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