"Something for nothing - There must be a catch?"
" Well, it depends on where you choose to obtain your free ssl certificates "
But why are test certificates important? As with any service, taking advantage of a freely available trial period in this case a test certificate not only allows you to prove that your server configuration works but it also gives you the ability to verify that the chosen provider can actually provide what they advertise.
Which vendors offer Test Certificates? VeriSign and Thawte both offer free Test Certificates - however the test certificates are not trusted by browsers. This can make testing configurations difficult.
Comodo and ipsCA are the only SSL providers who issue fully functional Trial SSL Certificates. Their test certificates provide full SSL functionality for 30 days and are fully supported by their technical support staff. Unlike test Certificates from other CAs, Comodo and ipsCA test certificates are issued using the same Trusted Root CA that issues their end-entity SSL Certificates, and not by a different test CA. This service helps you fully test your system prior to your live roll out and speeds issuance of the final certificate when you purchase a full multi-year certificate.
Why not apply for a trial anyway? It's another month for free!
Show me vendors who offer free fully functional trial certificates