Redirect to https not working, but same URL is OK in CF5

Hi
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I have a strange problem...

I use redirect action to redirect the user to a payment gateway. In CF 5 it looks like this:

https://payment.mypaymentprovider.com/upp/Start.jsp 

Works fine.
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In CF6 URL is this:

{url:https://payment.mypaymentprovider.com/upp/Start.jsp}

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If redirect starts, first I get a warning message from Firfox telling me that I try to access a non secure URL (no https). After I get redirected to the payment rejected page.
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Any idea why same URL is not working in CF 6?
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Thanks a lot.
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Regards
Patrick

Take out the {url:} part. Just have the straight URL you're redirecting to. {url:} doesn't work that way.
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On my website I have a FREE shortcode reference you can look at that shows you exactly how the shortcodes will look on your site.
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https://skyspider.com.au/store/shortcodes-reference

Thanks, but the problem is still the same.
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I now use

https://payment.mypaymentprovider.com/upp/Start.jsp

Does your payment provider require that the originating site (your site) has HTTPS as well?

I don't know, but the originating site runs with https anyway.

Meanwhile I figured out, there is a https warning as well, if using CF5. But the warning pops up when making payment, not before as with CF6. At the point the warning pops up, the user is on the website of the payment provider.

I start to think the problem is the payment provider. I'll dig deeper into this and will let you know the results.