Is there an alternative to HTTPS for securing a web site?

Question

At work we are always having numerous problems with our x.509 certificates that we use for https and I was wondering is there a useful alternative for securing the communication between a server and the browser.

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Edit Could also be that we are using IIS x.509 and WCF

Answer 1

Force site to only allow local traffic and use VPN to restrict access to local network. Other than that you will need to use HTTPS to force encryption.