Can not reach some web sites

[A.J. Bonnema]

On 09/19/2014 01:13 PM, A.J. Bonnema wrote:
> Hallo,
>
> I have been experiencing a problem with reaching some websites. 
> Example: I can not reach http://en.wikipedia.org.
> In my network I have 2 workstations, one gaming (windows) and one work 
> (fedora). When accessing the same sites from the gaming machine all is 
> reachable. When using Fedora I cannot reach en.wikipedia.org. In all 
> cases I get a time out from my browsers.
>
> What I have done to find the problem:
>
> 1. I have checked my Firefox addons by disabling them. That did not help.
> 2. I checked other browsers (epiphany and elinks). Neither can reach 
> the site.
> 3. I stopped the firewall and disabled it.  Same result.
> 4. I checked that I do not have any anti-virus program running.
> 5. I checked google to find causes and remedies, but nothing outside 
> what I already did.
>
> I am running Fedora 20 on an X86-64
>
> Does anyone have a idea what steps to follow in order to isolate the 
> problem? Maybe someone has a useful link?
> I have exhausted all that I know and subscribed to this mailinglist to 
> hopefully find some advice from people more experienced than me.
>
> Kind regards, Guus.
Additionally:

I also did a ping and a traceroute: I found the ping works. The 
traceroute only works if I specify --tcp (so the default udp does not work).

Regards, Guus.