I tried to log in to Phabricator using my GitHub account, but after entering user name and password correctly, I'm landed on this page https://reviews.facebook.net/oauth/github/login/?code=c440e14489ef15596a83&state= which reads:
GitHub Auth Failed Unable to authenticate with GitHub. There are several reasons this might happen: * Phabricator may be configured with the wrong Application Secret; or * the GitHub OAuth access token may have expired; or * GitHub may have revoked authorization for the Application; or * GitHub may be having technical problems. You can try again, or login using another method.