Thank you for willing to help. It was a coincidence. Just a few hours between update (including microcode) and server disabled. The real reason was expired default certificate. I once used httpd. The cert has been installed by mod_nss a few years ago. I somehow late at night yesterday missed "error" log to check while checked others. So, Apache was blocked to start until nss.conf is in place (or mod_nss). I finally removed mod_nss together with mod_resolver as dependence. There is old post on 8181 error but now mod_resolver is to be removed first. Thank you very much Mikhail Utin ________________________________ From: CentOS <centos-bounces at centos.org> on behalf of Richard <lists-centos at listmail.innovate.net> Sent: Monday, January 22, 2018 22:28 To: CentOS mailing list Subject: Re: [CentOS] failure to start httpd after today update > Date: Tuesday, January 23, 2018 00:55:28 +0000 > From: Mikhail Utin <mikhailutin at hotmail.com> > > Hello, > > I ran today update of my CentOS 6.9 running on Dell T105 (AMD > OPTERON) and httpd failed to start. Any idea what could cause that? > I never had a problem after CentOS 6.x update. Web server runs > since March 2017. I do updates usually once in a week. > A bit more information could be useful - versions/errors I don't believe that there has been an update to httpd for C6 since late october, with updates for a number of other things being released since then too (some of which, if installed, would have required a reboot). Knowing the httpd version you have installed would be a useful bit of detail. What does your logging show? If it appears that only httpd isn't starting, I would check the httpd error log first. If that doesn't show enough then try the /var/log/messages . _______________________________________________ CentOS mailing list CentOS at centos.org https://lists.centos.org/mailman/listinfo/centos CentOS Info Page<https://lists.centos.org/mailman/listinfo/centos> lists.centos.org This is a General discussion list for all issues CentOS. Security updates are currently announced on this list once daily. This list is read and reply for anyone that ...