Usually the reason you'd get "Permission Errors" posting is because you were supposed to handle an email authentication and did not.
As for the white page error, tell him to try to ping the website. (In Command Prompt, "ping <website>" to make sure he's getting a decent connection (under 150ms).) If the ping looks good, then there are two options: Bad browser/cookie/cache data, or the website is encountering server issues.
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