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I had the same problem with my old Powerbook G4 that I sold to a friend running 10.4.10 wirelessly. Except I couldn't even do a software update through the apple menu. She brought it back saying she messed with the proxies trying to connect to the school network. Firefox works fine that's it. I still haven't figured out what she did or how to fix it.
 
It's working now:)

He means click on your Apple logo in the top left corner of the screen, scroll down to LOCATION and change the option it is currently set to.

Thanks! I've been trying to solve this Safari problem for almost three weeks and nothing has worked until now. I broke it when I was unable to connect to another airport and fooled around with my network settings. The problem was when I finished messing with my settings I had selected "Location - Automatic" and made an assumption this would surely work, so I never once thought this might be the problem. Obviously, I was wrong.

Payback is this post of success.
 
Wow... and I thought I was crazy when I kept getting instant "can't find server" messages - even on sites likes eBay. And just for Safari. Never using FF.

Since I do not have another location set up, this 'fix' doesn't work for me.

Unsure it's worth creating a new location, since all but Safari works fine.

I guess learning this is a 'known issue' makes me somewhat assured. Seems pretty careless for Apple, though.
 
Check Network > Proxy Settings in System Preferences. I had 8 Macs using Leopard with (allegedly) identical configurations - 4 worked fine with Safari, 4 kept displaying 'can't find server'....grrrrrh. Eventually I discovered the port number in network\proxy settings was wrong. After I corrected this...hey presto!! (can't spell voila ;))
 
Hi, I'm having a strange issue after upgrading to Leopard. When I try to open certain pages in Safari it instantly gives me the "Safari can’t find the server" message. When I try to open the same page in Firefox at the same time it opens normally. For many pages (like this one) Safari is working fine. My connection seems good and this is happening on reliable sites (currently Safari won't open apple.com).

Any ideas?

I had the same problem. Safari, Mail, and Software Update had connectivity problems but Firefox and Outlook could connect just fine. I fixed the problem by resetting my router and then restarting the computer.

Mac OSX 10.6.6
 
This is happening to both Safari and Firefox for me and I am on OSX 10.6.5 Whichever cat that is...
 
There seems to be a lot of novice users here talking about this issue as well, so I'll go through what works for me step by step.

I have been having the same problem on and off. Sometimes when I reboot this happens and sometimes it doesn't, but it's annoying as I prefer to use Safari, especially as it has everything from my keychain across multiple devices.

First of all Mac apps don't use nslookup or dig, sure they are available to use at the command line for your convenience, but safari doesn't use either of them.

Mac apps use a process called mDNSResponder
try this:
sh-3.2# ps -ef|grep mDNS|grep -v grep

And you should see something like the following output:
65 898 1 0 12:10PM ?? 0:00.36 /usr/sbin/mDNSResponder
0 988 881 0 12:15PM ttys000 0:00.03 mDNSResponderHelper

So there are two process running that Mac apps need to translate website names to IP addresses.

Now this is just my theory, which I have tested and seems to hold up, but if those processes start before networking has loaded properly, you get this problem in Safari.

What fixes it for me is kicking those processes and there are two ways to do it...
from the list above, the process ID's are 898 and 988 so here are the commands:
sh-3.2# kill 898
sh-3.2# kill 988
this is the lazy way to do it and it works just fine, you can confirm the processes are running again with:
sh-3.2# ps -ef |grep mDNS|grep -v grep
65 1253 1 0 12:39PM ?? 0:00.11 /usr/sbin/mDNSResponder
0 1254 1 0 12:39PM ?? 0:00.03 /usr/sbin/mDNSResponderHelper
and note the process ID's have changed to 1253 and 1254 on my machine.

Note: If you send a kill -9 to these process then mDNSResponder will restart but mDNSResponderHelper will not. You will have to start it in the background.

####QUICK FIX RIGHT HERE###
For your convenience, here is a single command to do all of that so you don't have to worry about all of those words and stuff, just C&P the below and then start Safari :)
sudo ps -ef|grep mDNSResponder|grep -v grep|awk '{print $2}'|xargs kill

Before the purists get on my case, you can also restart these process with launchctl and here is how you do that:
sh-3.2# launchctl unload -w /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist
and then reload it again with:
sh-3.2# launchctl load -w /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist

Hope this helps someone that was as frustrated as me and unable to find a fix out there that worked :D
 
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