404 error occurred after login into the forum though pages are there

After login into the forum (phpBB), you will get an error message 404 (page not found though page
s are there.

This issue mainly occurring due to the https redirection instead of http.

Replace the following code in the profile.php, privmsg.php and includes/functions.php
$server_protocol = ( $board_config['cookie_secure'] ) ? 'https://' : 'http://';

with
$server_protocol = ( $board_config['cookie_secure'] ) ? 'http://' : 'http://';

Don't forget to replace the includes/bbcode.php
$text = preg_replace("#\[img\]((http|ftp|https|ftps)://)([^ \?&=\#\"\n\r\t<]*?(\.(jpg|jpeg|gif|pn
g)))\[/img\]#sie","'[img:$uid]\\1' . str_replace(' ', '%20', '\\3') . '[/img:$uid]'", $text);

with
$text = preg_replace("#\[img\]((http|ftp|http|ftps)://)([^ \?&=\#\"\n\r\t<]*?(\.(jpg|jpeg|gif|png
)))\[/img\]#sie","'[img:$uid]\\1' . str_replace(' ', '%20', '\\3') . '[/img:$uid]'", $text);

This will fix the issue.