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We get the following error;

The request was aborted: Could not create SSL/TLS secure channel

while using a WebRequest object to make an HTTPS request. The funny thing is that this only happens after a while, and is temporarily fixed when the application is restarted, which suggests that something is being filled to capacity or something.

Has anyone seen this kind of thing before?

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I seem to recall having this problem last year. I suspect that you aren't closing your WebRequest objects properly, which is why after a certain amount of use it won't allow you to create any new connections.

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I have exactly the same problem! I send two requisitions to an HTTPS webservice in close period range (seconds). The first requisition works fine, but the second requisition fails.

I´ve tried to set "System.Net.ServicePointManager.SecurityProtocol = Net.SecurityProtocolType.Ssl3", but the second requisition freezes...

I´m using VB.NET 2008.

Thanks

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This actually fixed the problem for me and I doubt I would have found it if it wasn't for your post. Hope you had better luck! Thanks!
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The similar problem for me fixed by: 

System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12;
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It looks like it may be a Conenction: Keep-alive thing: http://blogs.x2line.com/al/archive/2005/01/04/759.aspx#780

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I get the "The request was aborted: Could not create SSL/TLS secure channel" about once a day in one of my applications that handles a lot of transactions. I set the keep alive property to false and it didn't help any.

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