Connection from [a.b.c.d]… refused: too many connections and Exim
At times your Exim server might be overwhelmed: 2023-11-09 12:04:05 Connection from [188.234.244.30]:3802 refused: too many connections Your server is most likely under attack. Check
whm
How to upgrade IMAPSYNC on CentOS 7
Synopsis On CentOS 7 you might get these warnings: # imapsync –dry –host1 x.y.z.a –user1 user@example.com –password1 ‘xxxxxx’ –nosslcheck –host2 b.c.d.f –user2 user2@example.com –password2 ‘yyyyyy’
How do you programmatically add or remove a DNS record from WHM/cPanel?
Background The WHM API documentation has lot of information on adding DNS records. Delete a record is a mess, but we’ll get to that just
How to enable DNS management for WHM’s cPanel users
By default WHM doesn’t allow you to manage DNS for users. This has to be enabled by the administrator. Access WHM. Click on Packages -> Feature Manager. Select
How to disable ConfigServer Firewall on WHM’s LFD blocked emails
Background ConfigServer Firewall on WHM is incredibly noisy. To the point that you have to set up so many email rules just to be on
How to install imagick with WHM
Background At times WHM hosted WordPress sites may complain when checking security. “Some modules are not installed” The list typically looks like this: exif fileinfo
How to use ‘SHOW PROCESSLIST’ and ‘SHOW FULL PROCESSLUIST’ using MySQL on the command line
Update 28 October 2024 Full processlist isn’t very useful. Instead, just use show processlist. However, if you’re doing performance tuning for a WHM server, check
WHM/cPanel .EML files triggering “This message has been rejected because it has a potentially executable attachment”
WHM/cPanel might trigger a bounce such as the following: 2023-03-14 20:11:01 1pc96v-0007q4-15 cancelled by system filter: This message has been rejected because it has\na potentially
How to turn fine tune or turn off excessive notifications in WHM when using CSF Firewall
Background CSF firewall is a very powerful tool, but unfortunately the default notifications on a busy or mature system is way too heavy. It order
Bogus “Reverse DNS does not match SMTP Banner” using MX Toolbox on a WHM server
When testing Email Health using MX Toolbox, you might get 3 false positives: smtp server.example.com Reverse DNS does not match SMTP Banner More Info smtp