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The problem is with freeradius-dialupadmin:

with lines in /etc/freeradius-dialupadmin/config.php:
$curVer=intval(str_replace(".", "",phpversion()));
if( $curVer >= $testVer )
        import_request_variables('GPC');

I have:

[Wed May 07 13:40:19.294851 2014] [:error] [pid 2272] [client 192.168.10.19:59084] PHP Fatal error:  Call to undefined function import_request_variables() in /etc/freeradius-dialupadmin/config.php on line 9, referer: http://192.168.10.4/fradmin/buttons.php

If i comment this lines i have:

[Wed May 07 13:26:14.272903 2014] [:error] [pid 2271] [client 192.168.10.19:58985] PHP Notice:  Undefined variable: clear_fields in /usr/share/freeradius-dialupadmin/htdocs/nas_admin.php on line 269, referer: http://192.168.10.4/fradmin/buttons.php
[Wed May 07 13:26:14.272910 2014] [:error] [pid 2271] [client 192.168.10.19:58985] PHP Notice:  Undefined variable: do_it in /usr/share/freeradius-dialupadmin/htdocs/nas_admin.php on line 269, referer: http://192.168.10.4/fradmin/buttons.php
[Wed May 07 13:26:14.272916 2014] [:error] [pid 2271] [client 192.168.10.19:58985] PHP Notice:  Undefined variable: select_nas in /usr/share/freeradius-dialupadmin/htdocs/nas_admin.php on line 269, referer: http://192.168.10.4/fradmin/buttons.php
[Wed May 07 13:26:14.272923 2014] [:error] [pid 2271] [client 192.168.10.19:58985] PHP Notice:  Undefined variable: clear_fields in /usr/share/freeradius-dialupadmin/htdocs/nas_admin.php on line 271, referer: http://192.168.10.4/fradmin/buttons.php

Thanks for your help.

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             - Osvaldo T Crispim Filho -