Ask Different is a question and answer site for power users of Apple hardware and software. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I have two Macs behind a cable modem/WAP. One works fine. The other is able to ping servers but is unable to telnet to them. For instance pinging works fine but I get operation timed out errors when I wget or telnet 80. And nmap -Pn says host is up but all ports are filtered. I'm pretty sure this is a problem with the computer, not with the modem/router. Also, strangely some of my Chrome tabs can still reload, duplicate, and function, like google, Gcal and Gmail, but other's can't, and all new domains fail with Error 118 (net::ERR_CONNECTION_TIMED_OUT): The operation times out.. Skype chat and dropbox work. How can I further diagnose this problem?

share|improve this question

First step: check that Mac n°2 is connected with the network interface you think it should (i.e. Ethernet and not AirPort or anything else).

If you are using the famous Automatic network configuration you are never sure on which interface your computer is talking or replying. For example, your Mac n°2 might well be plugged toward the Internet through your neighbour Wi-Fi connection.

share|improve this answer
Thank you. It's wifi-only, and I created a new Network location and ensured it was using wifi and connected to my network. The problem persists. – user40344 Jan 25 '13 at 17:49
Hunting for behaviour differences! Could you run the same check on Mac n°1? Could you specify in your initial problem the OS versions of your 2 Macs? – daniel Azuelos Jan 26 '13 at 10:24

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.