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Have you tried going to Application Manager and checking installation settings "Online Certificate check" = Off and Software Installation = All?
I received a message saying that there s a new version of viber available on ovi store that I should get. Which I did.
I guess, you used this item.
Although scoobyman’s answer solves this issue, it opens up your Nokia to viruses and other bad applications. Signing makes sure, the author of the app is the one he claims to be. Signing makes the author responsible for what he does. If an author does something bad, his certificates gets revoked. OCSP makes sure, the signature is still good. Therefore, revert these two settings, after you installed an app you are trusting.
Furthermore, an application from the Nokia Store should work with any setting. Any error or warning message is not acceptable and should be forwarded to the Nokia Store team for further analysis.
a) Menu » Settings » Installations » Installations settings » Software installation
The state of this item does not matter because Viber is signed correctly. Therefore, ‘Signed only’ works for Viber and is recommend.
b) Menu » Settings » Installations » Installations settings » Online certificate check (OCSP)
The state of this item does matter. Therefore, please, set is at least to ‘On’. In Wireshark, I checked that the certificate is not revoked but good. Therefore, I have no idea what is wrong here. It this not normal.