I use XOOPS 2.0.5.1 package.
I can use administrator login.
But I can not get in the Administration MENU
It repeats
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This is your first time to enter the administration section. Press the button below to proceed.
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and
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Logging you in..
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If the page does not automatically reload, please click here
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How can I do ??

Answer:

close the local firewall system? It works.

Hello chiayi

Make sure your site is added to the trusted sites list of any firewall software you have. Your firewall stops XOOPS from writing the cookies it needs write for you to successfully log in

Hi Chiayi,
I had the exact same problem I think. At first, after following some false leads, I turned on register-globals(in php.ini), but it didnt help and is not necessary.(Its best to leave register-globals = Off)
I then did a complete re-install, and this time noticed that 2 of the install screens actually give a choice of 3 buttons to press.
Screen 'check PATH & URL' says click the button below to confirm your settings (previously I just clicked the next button) so I clicked the center button labelled 'reload'.
Anyhow, it dropped me back to the beginning of the install, then I just click through all the screens, because it remembers the settings, and I was able to log on no problems.
(by the way, this is a test install on my own machine, so no firewall, but its not directly in htdocs, but in htdocs/xoops)
rrbert