Having Windows Authentication breaks trackbacks, because the trackback agent is unable to read the web, as it is unauthorised – the event log shows 401 errors. I proved this today by enabling anonymous users, and then using file permissions to restrict access to the IUSR account so that whenever write access was required the user would be logged in. It worked – but the user was logging in and out – seemlessly, except for the sign in message switching to the username and back – as needed most of the time. Not a workable solution. I tried messing with impersonation settings in the web.config file, but I was playing way beyond my area of real knowledge and it didn’t work anyway.
I’ve posted the issue in the community server forum here.
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