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Migrate SHA-1 to SHA-2 at F5 LB : impact on CDN & apps; sites that use CDN/clean pipe provider

Last Modified: 2015-04-14
When converting SHA-1 to SHA-2 (or SHA256) certs, will apps (eg: IIS, Apache, Oracle Web server,
iPlanet, Weblogic, apps developed using Java, Html/Html5, Flash player & .Net Framework) be affected?  
If so, how are they tested after converting to SHA-2, just by checking the apps' logs?

if a website goes thru CDN & I use IE to check (press Ctrl-V & then select  ...Security Report...), what's
shown as SHA256 is what the website's F5 LB show or what the CDN show or what the cert in the
web server show?   Ie what's shown by IE Security report is from the CDN, F5 LB or the web  server?

When migrating F5 LB's cert from Sha1 to Sha2, anything needs to be changed in the CDN?
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