php session - upgrade error

[AlexJ]

Just updated php to 5.6 so that i can test out IPS 4.2.x and once update my live site, I am planning to update to php 7.0. While running the updater, I am getting below error - 

The upgrader uses PHP sessions to store data, however PHP sessions are currently not working correctly on your server. This is an issue you will need to contact your host about. 

 

Any idea how to fix it? didn't had that error before for php 5.5. - Thanks

Session is already enabled and works fine for IPS 3.4.x - No idea what's issue with upgrader.

[AlexJ]

Tried in IE and it worked. I guess, I am all set. 

[AlexJ]

Bump, same error in IE, when trying to update test forum.  Any idea? I see session are working for my live forums but only testforum installation is giving the issue. 

Thanks