I got the following message at logon:
OpenID 2.0 for Google Accounts is going away
Some applications and websites use OpenID 2.0 for authentication when you're signing in, and to access data that you've given them permission to access. Starting April 20, 2015, OpenID 2.0 will no longer work for Google Accounts.
If you've seen a warning that's brought you to this page, it means that you're using an application or website with OpenID 2.0 and may be affected by this change. For more information, we recommend you visit that application's help center, or contact its support team.
If you're a developer of an application that uses OpenID 2.0, you can learn how to migrate to OpenID Connect and the OpenID 2.0 end of life schedule.
have a look here
Do I have to change anything to access this Forum here after April 20th?
As you indicated, Google is removing support for its OpenID 2.0 service as of April 20, 2015. This means that after that date, you will not be able to authentication to the forum using the existing Google provider.
To change providers, log into the forum and then click your user name at the very top of the page. Under “User tools”, click “Authentication settings”. Click “Add new provider” and on the next page, click the Google+ button. You may have to log into your Google account.
Once you have added the Google+ provider, you can remove the old Google provider by clicking the “remove” link next to it.
Users with a Google authentication provider (who do not have a Google+ provider) will see a banner at the top of the page reminding them to make this change, with a link to this question. This information will also be added to the FAQ.