What the impacts of the SHA-1 deprecation will be on internal/intranet self-signed certificates?
Will this impact/stop internal/intranet HTTPS service such as web interfaces?
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As an organization, you typically have control on the policies implemented in your infrastructure, this includes policies governing the behavior of client software regarding certificate handling.
I am assuming you discuss the classic browser - web service relationship. With this in mind, take a look at the two main player's statements on this matter:
Even so, depending on the type/version of your clients, enforcement of bypass policies may be possible. Not that this would be an advisable course of action.