New boy arrived yesterday:
And this is how my work place looks now:
Yes, the second one (double monitored) works under XP, and it’s not going to change anytime soon. Thanks to Synergy I’m controlling MacBook using same keyboard and mouse I use with windows desktop - it speeds my work quite a bit.
Today suddenly my email server stopped accepting incoming connections. I wasn’t able to send any emails. After careful checking logs I have figured out that I’m a victim of DOS attack. More - I asked for it tuning maximum number of incoming connections in my firewall to low. Anyway, after correcting firewall I started to look over the internet how to better secure my Postfix configuration to prevent such problems in the future. What I have found is some simple main.cf tweaks posted on the nixCraft site:
disable_vrfy_command = yes
smtpd_delay_reject = yes
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks,
reject_non_fqdn_hostname,
reject_invalid_hostname,
permitsmtpd_recipient_restrictions =
permit_sasl_authenticated,
reject_invalid_hostname,
reject_non_fqdn_hostname,
reject_non_fqdn_sender,
reject_non_fqdn_recipient,
reject_unknown_sender_domain,
reject_unknown_recipient_domain,
permit_mynetworks,
reject_rbl_client list.dsbl.org,
reject_rbl_client sbl.spamhaus.org,
reject_rbl_client cbl.abuseat.org,
reject_rbl_client dul.dnsbl.sorbs.net,
permitsmtpd_error_sleep_time = 1s
smtpd_soft_error_limit = 10
smtpd_hard_error_limit = 20
Simple as that, and it works. Now I can see how my server is rejecting spammers one by one without even talking to them past HELO command.
Technorati Tags: email server, DOS attack, Postfix
I have just upgraded Firefox to it’s newest version. Of course there was problem with extensions - some of them are still not compatible with the newer Firefox. One which I needed the most for everyday work is the Zend Studio Toolbar. But I have found this blog so quick modification and test and voila - I have my toolbox upgraded. Time to go back to work…
Technorati Tags: Firefox, Zend Studio Toolbar
I’m pleased to tell, that today I passed the ZEND PHP Certification test and from now on I am a ZEND Certified Engineer.
Technorati Tags: ZEND, PHP Certification, ZEND Certified Engineer
I have just lost second laptop hard drive in last month. Both had about 4 years, both in Compaq laptops. Coincidence?
Funny thing - we did backups yesterday…
