HW: Lenovo T520 laptop with MS WIN 7 OR dedicated PC (DELL GX 280) SW: CentOS 6.5 (64-bit) installed using VMware Player on MS WIN 7 host CASE A) -- BRIDGED networking selected CASE B) -- NAT networking OR CentOS 6.5 i(32-bit) nstalled on real HW (DELL OptiPlex GX 280) ___issue____ at hand: The default Firefox ESR browser (17.0.10) does not find many web pages. regardless of the system (virtual - bridged or NAT OR real HW) For example: https://www.google.com/ works When I enter into search field string 'opera browser' https://www.google.com/search?q=opera+browser&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:unofficial&client=firefox-a I do get a lot of results back. So far so good. Then I click on the first searched link http://www.opera.com/ I get back Server not found Firefox can't find the server at www.opera.com Then I open gnome-terminal and type ping www.opera.com I get back __nothing__ [igor at localhost ~]$ ping www.opera.com PING www.route53.opera.com (54.244.236.138) 56(84) bytes of data. but when I type ping opera.com I get back [igor at localhost ~]$ ping opera.com PING opera.com (185.26.182.79) 56(84) bytes of data. 64 bytes from front-ams.opera.com (185.26.182.79): icmp_seq=1 ttl=41 time=174 ms 64 bytes from front-ams.opera.com (185.26.182.79): icmp_seq=2 ttl=41 time=122 ms ======================== another example ======================== http://www.delo.si/ works http://www.dnevnik.si does __not__ work http://www.centos.org/ works but when I click on the link Special Interest Group on the same page http://wiki.centos.org/SpecialInterestGroup , the link does NOT work. I get back Server not found Firefox can't find the server at www.opera.com. :::important::: All the examples from above work flawlessly on the MS WIN 7 on the same laptop, the same ETHERNET cable connected to the same switch hub with the same router at the same time. [Reminder: CentOS 6.5 runs on VMWare on WIN 7] Any hint, FAQ, pointer to RTFM is more than welcome I am puzzled, please help -- "You can't run an economy where the financial sector is making 40 percent of the profits." former Fed Chairman Paul Volcker 2009