I had a working ISPconfig till yesterday for years (thanks to Falko) and all the sites that I created were working till then. But all of sudden, all sites stopped responding (they give blank pages or server not found error). I didn't change anything in the meantime. I checked the site specific error logs but there I found nothing (empty). However, I can access the ISPConfig control panel (I have ISPConfig 2.2.9 installed in remote server). ssh with IP address is possible, but the admin owners could not ssh with their domain names like 'ssh firstname.lastname@example.org" I found it very weird behavior, could anyone suggest me where did I went wrong? The PHP Safe mode is off for all sites. Thanks!