I am trying to set the permission
I have one folder as following:
david@raspberrypi /var $sudo chmod 770 www
ls -l
david@raspberrypi /var $drwxrwx--- 2 www-data www-data 4096 Aug 14 11:19 www
david@raspberrypi /var $ cd www
-bash: cd: www: Permission denied
david@raspberrypi /var $ groups david
david : david www-data
david@raspberrypi /var $ cat /etc/group |grep 'david'
www-data:x:33:david
david:x:1002:

Also , i have create new account called Pen, it can access the folder successful....
david@raspberrypi /var $ sudo useradd -m -g www-data -s /bin/bash Pen
david@raspberrypi /var $ su Pen
Pen@raspberrypi /var $ cd www
I would like to know why i cannot access the folder?
Any Idea for here?

Hi david,

Could you please check whether you are getting any error message in /var/log/messages file . If you are getting any error please post .

Regards

Hi,
i have check my /var/log/message and /var/log/syslog
It no any error message about permission denied....
Content as following.
/var/log/message:
Aug 12 14:38:14 raspberrypi kernel: [ 23.276214] smsc95xx 1-1.1:1.0: eth0: link up, 100Mbps, full-duplex, lpa 0x4DE1
Aug 12 14:38:18 raspberrypi kernel: [ 31.033982] Adding 102396k swap on /var/swap. Priority:-1 extents:1 across:102396k SS
Aug 14 08:28:51 raspberrypi kernel: [ 63.422391] EXT4-fs (mmcblk0p3): mounted filesystem with ordered data mode. Opts: (null)
Aug 14 08:28:52 raspberrypi kernel: [ 63.790518] ip_tables: (C) 2000-2006 Netfilter Core Team
Aug 14 08:28:52 raspberrypi kernel: [ 63.895338] nf_conntrack version 0.5.0 (3446 buckets, 13784 max)
/var/log/syslog:
Aug 14 13:09:01 raspberrypi /USR/SBIN/CRON[2736]: (root) CMD ( [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 -maxdepth 1 -type f -ignore_readdir_race -cmin +$(/usr/lib/php5/maxlifetime) ! -execdir fuser -s {} 2>/dev/null \; -delete)
Aug 14 13:17:02 raspberrypi /USR/SBIN/CRON[2747]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)
Aug 14 13:39:01 raspberrypi /USR/SBIN/CRON[2758]: (root) CMD ( [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 -maxdepth 1 -type f -ignore_readdir_race -cmin +$(/usr/lib/php5/maxlifetime) ! -execdir fuser -s {} 2>/dev/null \; -delete)
Aug 14 14:00:12 raspberrypi dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 5
Aug 14 14:00:12 raspberrypi dhclient: DHCPREQUEST on eth0 to 255.255.255.255 port 67
Aug 14 14:00:12 raspberrypi dhclient: DHCPOFFER from 192.168.1.1
Aug 14 14:00:12 raspberrypi dhclient: DHCPACK from 192.168.1.1
Aug 14 14:00:13 raspberrypi dhclient: bound to 192.168.1.128 -- renewal in 17352 seconds.

Had you just created the group? You may need to log out and in again. The kernel has a list of your login shell's groups, which may be missing www-data if you created it during the current session.

Hi,
Could you please check is there any error is reported in the below mentined files


/var/log/secure or /var/log/auth.log

please check /etc/sudoers file whether any permissions are configured.

Could you please tell me are you using any application for providing the additional security.

Regards

Thank all,
I try to login again , it work.
Thank All.