Recently I've needed to request a new SSL certificate for a website running on IIS6. The existing website has a certificate that I'm looking to replace, but as this was originally generated as a 1024-bit certificate, I cannot prepare a new request for the website through the IIS6 tools - I can only renew it.

Chaining the Supplied Certificate with Intermediate Certificates

Testing the Received Certificate Against the Original Request and Private Key

Building the PKCS#12 File from Certificate & Private Key

Useful Tips: Exporting Certificate & Key from PFX File

Useful Tips: Issuing a Self-Signed Certificate for Development

Openssl

Using OpenSSL to Request and Install an SSL Certificate