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JasoN ZhanG 4JasoN ZhanG 4 

I tried to open the test link (https://tls1test.salesforce.com/) , and get "Could not connect to server" error ,what should we do before the upgrade

We got one notification that Salesforce is disabling TLS 1.0 for all sandbox instances on June 25, 2016 at 9:30 AM PDT (16:30 UTC).
I checked this article : https://help.salesforce.com/apex/HTViewSolution?urlname=Salesforce-disabling-TLS-1-0&language=en_US&

and I tried to open the test link (https://tls1test.salesforce.com/) , and get "Could not connect to server" error , attached is my screenshot , what should we do before the upgrade to ensure there is no issue after the upgrade? my screenshot is as below ,  thank you very mcuh!
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