Mysql – DRupal and thesql with a remote database

It looks like you are using InnoDB as your primary database engine type, but you configuration has no InnoDB configuration tuning options, which means you are using the defaults. These defaults, out of the box are sized for an 8Mb machine!

I recommend these settings as a basis and work from there

innodb_file_per_table
set-variable = innodb_buffer_pool_size=2G
set-variable = innodb_log_files_in_group=4
set-variable = innodb_log_file_size=128M
set-variable = thread_cache_size=10
set-variable = table_cache=512
set-variable = query_cache_size=8M

You didn't say if the php site was sharing the same machine as your db server, so you will have to be careful that MySQL doesn't consume so much physical ram that it causes the machine to swap.

I'd also recommend that you add these settings to low slow queries and queries with a poor query plan.

log_slow_queries
log-queries-not-using-indexes
set-variable = long_query_time=1

There are couple of things to consider

1. Turn selinux off or set it to permissive mode

2. Check the selinux context of read/write permission directory

3. Clear the cache of your browser and try again.

4. restart apache and try again.

5. Check if the directory has any disk quota and it exceeded the limit.