MAX.gov was kind enough to run us a proxy in order to support https, and that proxy had a bad day under load. Described more here https://github.com/18F/web-design-standards/issues/733

Btw, GSA and OMB aren't connected the way you describe. They just happen to be the respective parent agencies of 18F and USDS-HQ. Here's a tree.

  POTUS
  ├── GSA
  │   └── 18F
  └── OMB
      ├── USDS-HQ
      └── MAX