Error in login - logout

[suxilo53]

I have the following issue when trying to bridge coppermine and PhpBB 2.0.21:

The Bridge works correctly but when I make login, or logout from Coppermine Gallery I have this error message page

You are not authorized to view this page
You might not have permission to view this directory or page using the credentials you supplied.

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HTTP Error 403 - Forbidden
Internet Explorer 

Login.php file attribute on server 755
Logout.php file attribute on server 755

Coppermine install: http://lnx.minimotoracing.it/gallery/
Forum install: http://lnx.minimotoracing.it/forum/
Coppermine version: cpg1.4.9
Forum version: PhpBB 2.0.21
Test user account:  USER prova_mmr / PSW prova

BridgeManager settings:
Forum URL:  http://lnx.minimotoracing.it/forum
Relative path to your BBS's config file:  ../forum/
Use post-based groups?:  0 

Could you help me, please?
Thank you in advance for your help!!!

[Nibbler]

Clicking your forum URL gives me an Internal Server Error. What do you have set as the board url in phpbb?

[suxilo53]

Clicking your forum URL gives me an Internal Server Error. What do you have set as the board url in phpbb?

I made a mistake configuring permission on index.php on phpbb forum.

Now the system seems to work correctly!!! I make a modify on phpbb forum configuration and maybe I found the problem!

Thank you very much for your support anyway!