The "Login" link on the dbGaP Authorized Access System login page is supposed to redirect you to a NIH login page where you can use the login credentials of your eRA Commons account to access the dbGaP system.

(07/03/2017)

The dbGaP Authorized Access System authenticates users using NIH eRA Commons account information. Your dbGaP login only works if your eRA Commons account login works. Most of dbGaP account login problems are due to issues related to eRA Commons account login. If you have problems logging in to your eRA Commons account, please seek assistance from the eRA Commons helpdesk before trying to login to the dbGaP system again. If your eRA login succeeds but dbGaP login fails, please contact the dbgap-help at vog.hin.mln.ibcn@pleh-pagbd.

(07/27/2017)

The dbGaP Authorized Access System authenticates users using NIH eRA Commons account information. If you have a problem with logging into the dbGaP system, it could be simply because the login credentials (username or password) that you are using are incorrect. The login credentials for dbGaP login is the same as those of your eRA Commons account. You can reset your password online at the eRA commons “Reset Password” page.

After resetting the password and making sure it works for the eRA Commons account, please allow one or two days for the change to be propagated from eRA to the dbGaP system before trying to log in to the dbGaP system again.

(07/27/2017)

Please see here for the answer (07/03/2017)