GAE – WordPress Akismet error

I am having a problem in activating Akismet plugin on GAE. When I opened https://my-blog.appspot.com/wp-admin/plugins.php?page=akismet-key-config&show=enter-api-key, I got this error:

There was a problem connecting to the Akismet server. Please check
your server configuration.

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The following is the GAE log,

2013-11-02 10:15:55.761 /wp-admin/plugins.php?page=akismet-key-config&show=enter-api-key 200 360ms 19kb Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/30.0.1599.101 Safari/537.36
218.212.43.178 – - [02/Nov/2013:10:15:55 -0700] “GET /wp-admin/plugins.php?page=akismet-key-config&show=enter-api-key HTTP/1.1″ 200 19070 – “Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/30.0.1599.101 Safari/537.36″ “wp-dot-ms-cloud-blog.appspot.com” ms=360 cpu_ms=303 cpm_usd=0.002131 app_engine_release=1.8.6 instance=00c61b117c65c8b3d0eb64b28603f5d885d3b793

I wrote about all issues that I have in this post. Is there anyone who activated the Akismet plugin and ran WordPress successfully on GAE?

• I am NOT trying to send traffic to my blog from StackOverflow. I already posted the error message and log here so you can figure out the issue without clicking on my link. But one guy from Google commented that Akismet should be working fine in my post so I am posting the link in case anyone wants to follow up and see the screenshot in the comment section.