You could simply ignore the invalid certificate if you are not sending any sensitive information. This article describes how you could do that. Here is an example implementation by Alexandre Colucci for one of the methods described in that article.
Are you using an HTTPS url. If so go to the url in a browser and check the certificate. Ensure the certificate is valid for the domain or sub domain that you are trying to use, and that all the intermediate certificates have been installed on your server.
I had a problem similar to this, and the solution was to install the intermediate certificates.
This is not an answer, but a suggestion to enhance performance, Answer is already given by uvesten.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.