my.cnf parameters to enable binary logging mySQL 4.1.20

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I'm having problems
enabling binary logging on mySQL 4.1.20

After
adding

log-bin=/var/log/mysql/tts_db

to
my.cnf, mysql fails to restart, with the following error in
mysqld.log:

091112 03:36:37 mysqld
            started
/usr/libexec/mysqld: File '/var/log/mysql/tts_db.000001' not found
            (Errcode: 13)
091112 3:36:37 [ERROR] Could not use /var/log/mysql/tts_db for
            logging (error 13). Turning logging off for the whole duration of the MySQL server
            process. To turn it on again: fix the cause, shutdown the MySQL server and restart
            it.
091112 3:36:37 [ERROR] Aborting


091112
            3:36:37 [Note] /usr/libexec/mysqld: Shutdown complete

091112
            03:36:37 mysqld ended

Whilst
looking at it to ask this question, I may have stumbled on the answer, but I'll check
anyway - I can't restart the server until tomorrow morning.
The mysql
directory (/var/log/mysql) is owned by root. Is this problem because the mysql user that
the server runs as doesn't have the correct privileges for creating a file in the
directory?

Here's the complete my.cnf ( i know
the log-bin is commented out - this is the current
one)

[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock

set-variable=local-infile=0

set-variable
            = max_connections=130


long_query_time =
            1
log-slow-queries =/var/log/mysql/mysql-slow.log

#
            Default to using old password format for compatibility with mysql 3.x
#
            clients (those using the mysqlclient10 compatibility
            package).
old_passwords=1

skip-bdb

#
            We can't skip networking because the phpList server is on a different
            server.

#skip-networking
set-variable =
            innodb_thread_concurrency=2

table_cache =
            512
query_cache_size = 20M
key_buffer_size =
            64M
thread_cache_size = 10
tmp_table_size = 48M
# Added 11
            Nov 2009 to enable binary logging for replication
server-id =
            1

#log-bin=/var/log/mysql/tts_db
#expire-logs-days =
            2
#max_binlog_size =
            500M
#binlog-do-db=tts_db

#==============================================================================
#
            mysql.server
            section
#==============================================================================
#
[mysql.server]

user=mysql
basedir=/var/lib

#==============================================================================
#
            mysqd_safe
            section
#==============================================================================
#
[mysqld_safe]
err-log=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

skip-bdb

set-variable
            = innodb_thread_concurrency=2

table_cache =
            512
query_cache_size = 20M
key_buffer_size =
            64M
thread_cache_size = 10
tmp_table_size =
            48M


open-files-limit =
            4096

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class="normal">Answer

In
general on Linux systems, an Errno 13 means
Permissions Denied or Access Denied.

What's the output
of

# ls -ld
            /var/log/mysql
# ls -l
            /var/log/mysql

Does
this match with your MySQL user?

If not,
suggested solution (providing mysql is your mysql user and mysql is your
group):

chown -R mysql:mysql
            /var/log/mysql