can not connect to or IP addr port 80

Eduardo Lemos de Sa eduardo.lemosdesa at
Mon Aug 1 19:30:48 UTC 2016

Dear Matthias

On Mon, Aug 1, 2016 at 3:41 PM, Matthias Apitz <guru at> wrote:

> Hello,
> I have some FreeBSD CURRENT netbooks and one Ubuntu in my WLAN, the WAN
> IP addr is (as shown by )
> none of the WLAN workstations can reach at port 80;
> the command
> telnet 80
> shows resolving to the IP addr, but does not connect; a
> tcpdump shows only SYN pkg going out to but no SYN answer
> is coming in. This is as far as I can see the only side which is not
> reachable, all other port 80, 443 and SSH 22 to anywhere is just fine;
> Any ideas what could be wrong? I'm afraid, when I contact my ISP (a
> German local telephone provider) they will ask me if I have the latest
> Win7 patch installed ... :-)
>         matthias
> --
> Matthias Apitz, ✉ guru at, ⌂> +49-176-38902045
> "Wer übersieht, dass wir uns den anderen weggenommen haben und sie uns
> wiederhaben wollen,
> kann von den Kämpfen der letzten Tage keinen verstehen. Und kann natürlich
> auch keinen
> dieser Kämpfe bestehen." Hermann Kant in jW 1.10.1989
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I had the same problem last week, despite for all friends in Brazil was
everything ok. Some conclusions:

1) yes, the IP address is (so, your DNS is ok)

2) Try , so that you can check if the site
is working, or

3)  , so that you can test
from which places are able to connect

Of course, the last one is on Brazil, but it is a test to be done

I didn't was able to solve the problem by myself. Someone, on my network (I
was on job) heard my complains and fixed it. My conclusion was that is was
caused by some bad configured firewall (ping was working, but not http).



Eduardo Lemos de Sa
Associated Professor Level 4
Dep. Quimica da Universidade Federal do Paraná
fone: +55(41)3361-3300
fax:   +55(41)3361-3186

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