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The message is quite right: Your sender's domain hasn't got either an MX or A record. $ host vps1.preschem.com Host vps1.preschem.com not found: 3(NXDOMAIN) According to RFC 5321 section 2.3.5 the sender domain must be valid and resolvable. If not, any mail server can reject the mail. You fix the issue by giving it an appropriate address record or ...


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Only way you can test it for sure is to run a benchmark like "ab" and test the number or visitors your site can sustain - and troubleshoot what's going on on the server in the meantime. Run something like: $ ab -n 10000 -c 50 http://yoursite.com/ from your pc or other server. This will hit your server with 10'000 requests, but not more then 50 ...


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Fix the typo root /var/www/example.com/htocs/;


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Some mail servers, to mitigate spam, require that the sender's domain resolves to a proper dns 'A' record and in extreme cases to an 'MX' record. Doing dig on vps1.preschem.com for 'A' or 'MX' records does not return anything. Solution - Add A record for vps1.preschem.com root@svm1010:/var/tmp# dig vps1.preschem.com MX +short root@svm1010:/var/tmp# dig ...


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OK I posted this ages ago and sort of gave up. Then I decided to revisit and did some research. My server uses APC opcode caching to improve php performance. I put an apc.php file in my site's root which allows me to see the stats of the cache. Fragmentation was at 100% and ti was getting over 50% misses. In the /etc/php5/conf.d/apc.ini file I just had to ...


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It looks like the private key is too open as it is group readable. Try removing the group read permissions chmod g-r wp_rsa and see how that goes.


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Figured the problem out. My /etc/httpd/conf/httpd.conf had AllowOverride set to None. Once I allowed overrides for my directory, .htaccess started affecting the configuration. Now, permalinks work as they should.


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You can add the following line to your wp-config.php file for direct filesystem writing: define('FS_METHOD','direct');


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When looking into performance issues it's important to remember the 'big 4': -CPU -Memory -Disk -Network I'm a big fan of using atop for CPU and Memory utilization, iotop for Disk usage, and iftop for network traffic. Keep in mind, these metrics are only useful in real time when the server is under load and experiencing this issue. Any of the big 4 above ...



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