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Did you create this file as root?
What are the permissions on this file?
Post the output of:
ls -l /path/to/postfixadmin.conf
where /path/to/ is the path to where the file is stored on your system.
It may be that the file is only readable by the root user. Can you open the file from a root terminal? Become root and run vim postfixadmin.conf in the directory where postfixadmin.conf resides, or use nano postfixadmin.conf as root and see if you can open it.
Are you able to open any other files with the extension .conf, either as root or as a regular user?
Distribution: RHEL 5.1 on My PC, & SunOS / Sun Solaris, RHEL, SuSe, Debian, FreeBSD and other Linux flavors @ Work
Post the location of your file and also the output of these commands:
ls -l yourFile.conf
as pointed out by the two guys above.
Remember that you need to be the owner of a file that you want to open or you must be a member of the group that the file belongs to. Otherwise, the third group called "others" should be given at least read permission to see the contents of the file.
chmod 666 fileName
would give read/write permissions to everybody. You can become the root by issuing the following command:
[root@localhost Desktop]# service httpd restart
Stopping httpd: [FAILED]
Starting httpd: httpd: Syntax error on line 221 of /etc/httpd/conf/httpd.conf: Could not open configuration file /etc/httpd/conf.d/postfixadmin.conf: Permission denied