Photoshop CS6 Serial Number validation

[charlotteh5959044]

Hi Can anyone help, after shutting down my computer and re-starting my Photoshop wouldn't open. It is version CS6 (disk version) and my operating system is OX S Yosemite.

This error message comes up when I enter my serial number it says I need to be connected to the internet (which I am)

[kglad]

adobe recently upped their requirements for browser security, https://helpx.adobe.com/x-productkb/multi/eol-tls-support.html

otherwise, if you have a non-current os, https://helpx.adobe.com/x-productkb/multi/eol-tls-support.html#sa_src=web-messaging000

otherwise, confirm that you can connect to the secure adobe servers by reading, http://helpx.adobe.com/x-productkb/policy-pricing/activation-network-issues.html do you see both logos? if you can and still see a connection error try these steps, https://helpx.adobe.com/download-install/kb/common-network-connectivity-issues.html

if those all fail, white list the adobe network endpoints, https://helpx.adobe.com/enterprise/kb/network-endpoints.html

[charlotteh5959044]

Thank you - what do you mean by white list the adobe network endpoints? I downloaded from the link..

[Peru Bob]

 what do you mean by white list the adobe network endpoints? I downloaded from the link..

By @charlotteh5959044

See the link given by kglad :  

https://helpx.adobe.com/enterprise/kb/network-endpoints.html