6 Replies Latest reply: Mar 28, 2013 2:45 AM by Neville Hillyer
LoftyWalrus Level 1 Level 1



Several times a day my Powermac G5 Dual 2.0 GHz will lose it's ability to browse the web. I'm using ethernet to connect to my router which is connected to my cable modem (so this is not a wireless problem). Suddenly, at seemingly random times while surfing, my browser will simply not be able to load a web page. Trying other browsers results in the same problem (Safari, Opera, and Seamonkey all have this issue). If I go to Network system preferences it reports that I'm connected and gives my IP address. So it seems to think everything's fine, but it's not.


HOWEVER, if I login to my wife's account on the same computer and load any web page and THEN go back to my account, I can continue surfing without problems, at least for a while. So my web browsing goes out until I use a different account to load a page, which seems to cause my account to start working again. Other accounts on this computer do not experience this problem.


Another interesting bit is that if I'm running a download helper program it will continue to download when the problem occurs, so it's not that I lose all internet connectivity. It appears to be only web browsers that have this problem.


Got any ideas to try to fix this? Thanks!


- LW

Power Mac G5 (June 2004), Mac OS X (10.5.8)
  • Klaus1 Level 8 Level 8

    If Safari is getting very slow:


    (Presumably you regularly empty your Safari cache by deleting the following file:




    and clear your History)


    Adding Open DNS codes to your Network Preferences, should give good results in terms of speed-up as well as added security, (including anti-phishing and redirects) (Full information about Open DNS is here:   http://www.opendns.com/home-solutions ) and further independent information can be read here:


    http://reviews.cnet.com/8301-13727_7-57338784-263/free-dnscrypt-tool-enhances-ma c-web-security/?tag=mncol;txt


    and here:




    If you are using a single computer: Open System Preferences/Network. Double click on your connection type, or select it in the drop-down menu, and in the box marked 'DNS Servers' add the following two numbers:



    (You can also enter them if you click on Advanced and then DNS)


    Sometimes reversing the order of the DNS numbers can be beneficial in cases where there is a long delay before web pages start to load, and then suddenly load at normal speed:




    If your computer is part of a network:please refer to this page: http://www.opendns.com/start/best_practices/#your_network and follow the advice given.


    If you use a Router, make sure it has the latest firmware installed.


    One reason for a slowness in page loading may be the 'DNS Pre-fetching' feature of Safari 5.x as is described here:




    You can cancel DNS pre-fetching by going to Terminal and typing:


    defaults write com.apple.safari WebKitDNSPrefetchingEnabled -boolean false


    You have to restart Safari for it to take effect.


    If Safari seems to hang for ages:


    If you have a lot of tabs open and/or a lot of pages running Flash, Safari can sometimes 'hang', requiring a restart of Safari. This can often be inconvenient, and as it is rarely Safari itself that is hanging but merely one of its plug-ins, usually Flash, there is a way using Terminal to restart the plug-ins (without restarting Safari and losing your tabs) by quitting the WebPluginHost process:


    Open the Terminal from the Utilities folder in /Applications and type

    killall -9 WebKitPluginHost

    Note that this command kills all Safari plug-ins, not just Flash. All plug-ins should start back up when you reload the page.

    Then go back to Safari and refresh any pages that were using the Flash plug-in. This also fixes the Beachball of Death. Try this whenever Safari gets slow or freezes. The later versions of Flash 10.1 onwards appear to have improved the situation somewhat, but haven't completed eliminated it.

  • Neville Hillyer Level 4 Level 4

    Sometimes reversing the order of the DNS numbers can be beneficial in cases where there is a long delay before web pages start to load, and then suddenly load at normal speed:


    Any DNS change will flush the DNS cache. I flush mine regularly automatically - old Apple DNS software copes poorly with modern loads.


    Set History to 7 days.


    Turn off RSS.


    Turn off Fraudulent sites.


    Never use tabs unless you have a lot of memory.


    Use Safari's Reset facility once a day with the following settings:


    Picture 1.png

  • LoftyWalrus Level 1 Level 1

    Thanks, but I tried flushing the cache and the problem persists.


    This is not a Safari problem per se. It happens, as I said, with all browsers. And it's not a delay issue. Safari will fail to load immediately with a "can't load page" error, and Seamonkey just sits there trying to load the page. This goes on until I go to another account, load any web page, and then back to my account and hit refresh.


    - LW

  • Neville Hillyer Level 4 Level 4

    Have you tried changing your browser home page?


    If all else fails open a new account on the Mac and use that.

  • LoftyWalrus Level 1 Level 1

    Hmm. Change the browser home page? I'll try it, but why do you think it would work? I could be on any site and the problem will just suddenly happen.


    I really REALLY don't want to switch accounts. There has to be an explanation for this behavior.



  • Neville Hillyer Level 4 Level 4

    I suspect you have upset your Mac by installing third party software.