No not the waiter kind. But if you are waiting on a localhost connection then you may be subject to a missing legacy linkage. If you are running moodle and can't get to a page via local host but can do with 127.0.0.1 loopback then you have probably got a problem with your hosts file.
See this description of how to fix that with reference to the issue that can occur with Moodle anywhere. Localhost correction for legacy IPv4 from IPv6