MacOS – Cannot access specific website (MBP – OS X 10.10.5)

dnsmacosNetworkwebsites

I’m having problems connecting to a certain website. It’s random whether the site loads but recently it’s been getting worse. What happens is that I turn my router and computer off at night, then after rebooting in the morning more often than not the site in question will not load. This happens even though I could access it the day before without any difficulty. A reboot of the router is what triggers the glitch. All other web sites load as they should.

The site itself is ok since I can access it via a proxy server and DownForEveryoneOrJustMe.com verifies it’s online. I suspect it has to do with my computer since I can access the site using an Android tablet via wifi (same router & modem).

Things I’ve tried on my computer:

  • tried 3 different browsers (Firefox, Safari, Opera);
  • cleared the browsers' caches and disabled firefox addons
  • ran Onyx in automation mode, rebooted.
  • deleted SystemConfiguration in /Library/Preferences/SystemConfiguration then rebooted.
  • tried booting into 2 different HD disks.
  • flushed the DNS cache (from Admin account)
  • added/removed DNS addresses on Google & OpenDNS. Currently use my ISP’s DNS addresses.
  • disabled OS X firewall briefly. Disabled & reinstalled GUI app for OS X firewall.
  • disabled LittleSnitch, rebooted.
  • checked /etc/hosts (localhost entries only)
  • changed MTU to 1453 in Preferences > Network > Advanced > Hardware (Manual, 1453)
  • called my ISP. They told me it was a problem with my computer.
  • A ping test results in 100% packet loss and Request Timeout.

Router & modem

  • reset router and modem to factory settings and rebooted.
  • tried 2 different routers; one wifi, one wired, same maker.
  • bypassed the router so that the modem was connected directly to my computer. Problem persisted after modem/computer reboot.

I have no anti-virus software installed but I recently upgraded to a new modem. Am using a Macbook Pro on OS X10.10.5. I’d appreciate any suggestions as I’m out of ideas. Thanks.

Best Answer

1 - Run Disk Utility from the Utilities folder and "Repair Permissions." Let it run. It will take a while. When it is done, quit the program.

2 - Reinstall an anti-virus program and run a scan.

3 - Open Safari and from the "Safari" menu, click on reset Safari.

4 - Go to System Preferences, click on "Security and Privacy." Make sure your firewall is set to "ON."

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