The payment merchant recently ran a security test on my magento 220.127.116.11 site which failed. After speaking to them i was advised to disable the DES-CVC3-SHA.
Any advice would be appreciated.
If you're hosting your website on any kind of shared hosting, ask your hosting provider do disable it for you, since SHA1 is no longer considered as secure enough.
If you're hosting your website on standalone web server, you'll have to do it by yourself. Take a look at this link: