Hi,
Ok I've installed hotfix http://support.microsoft.com/kb/2861663 on the primary site server and secondary site servers.
Then I installed the SCCM client on the Windwos 8.1 client. I can see the client in the database and it's active but when I try to push an package to it it won't pick up the advertisement. The execmgr.log says 'Software distribution agent was enabled' but
that's it.
Also it won't install Software Updates, the WUAHandler.log says
Scan failed with error = 0x8024401b.
0x8024401b = Same as HTTP status 407 - proxy authentication is required.
Source: Windows Update Agent
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We struck this issue when we introduced Win8.0 and CM12. It seems that because we use an authenticated proxy for our people to access the internet, and we also use WPAD and proxy.pac, that we uncovered a case-sensitivity issue, in that our SUP servername site
system, was entered as FQDN.CONTOSO.COM but our proxy.pac file had only ever handled contoso.com, and, javascript processing of the proxy.pac is case sensitive all of a sudden for us.
We then found that no matter how we entered the fqdn into ConfigMgr, it automatically converts the case to upper, so we had no choice but to edit our corporate proxy.pac to handle both the cases. We opened a Premier case about the automatic upper-case conversion,
and were told "that's how it is. file a DCR if you like&