Why can't I join my AWS EC2 instance to my Simple AD?

I'm unable to join an EC2 instance to my Directory Services Simple AD in Amazon Web Services manually, per Amazon's documentation.

• I've verified that the IP I entered for DNS in the network config on the EC2 instance is the DNS IP for the Simple AD.
• I'm entering the FQDN foo.bar.com.
• I've verified that the Simple AD and the EC2 instance are in the same subnet.

This is the error message I'm receiving:

The following error occurred when DNS was queried for the service location (SRV) resource record used to locate an Active Directory Domain Controller (AD DC) for domain "aws.bar.com":

The error was: "This operation returned because the timeout period expired." (error code 0x000005B4 ERROR_TIMEOUT)

The query was for the SRV record for _ldap._tcp.dc._msdcs.aws.bar.com

The DNS servers used by this computer for name resolution are not responding. This computer is configured to use DNS servers with the following IP addresses:

10.0.1.34

Verify that this computer is connected to the network, that these are the correct DNS server IP addresses, and that at least one of the DNS servers is running.