How can I get Pinax's OpenID to work with NAT? [migrated]

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http://unix.stackexchange.com – I have a Pinax gunicorn deployment behind a NAT, where the outward-facing Apache server does a ReverseProxy to the gunicorn server. Overall it works well but when I try to log in with OpenID I get an error: Proxy Error The proxy server received an invalid response from an upstream server. The proxy server could not handle the request POST /openid/register/. Reason: Error reading from remote server How can I get Pinax to cooperate with NAT? (HowTos)