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I've OS X Yosemite 10.10.3. Since sometime dropbox.com is not accessible on my mac. Now since few days dropbox in my finder doesn't sync. I uninstalled it and now I cannot install as dropbox.com doesn't connect. I have done all the updates since updating to Yosemite. The traceout shows that the second last hop blocks the connection. Could anybody please help me?

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  • Can you log in in to the Dropbox on-line version (without installing it on your Mac) – Ruskes May 31 '15 at 4:59
  • No I can't. The website is unaccessible since months. I can login to my account from other mac and pc and my mobile. – anust May 31 '15 at 9:12
  • Could you show us the trace with the problem – Ruskes May 31 '15 at 16:43
  • 20 ae13-sjc8-dr02.net.dropbox.com (108.160.174.234) 572.383 ms ae11-sjc8-dr01.net.dropbox.com (108.160.174.230) 410.248 ms 508.492 ms 21 108.160.164.19 (108.160.164.19) 628.087 ms 408.700 ms 108.160.164.25 (108.160.164.25) 409.703 ms 22 * * * 23 * * * 24 * – anust May 31 '15 at 19:00
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For some reason your connection time is very long.

Lets test it.

Open the Terminal app located in your Utility folder.

Now type Ping dropbox.com

It should come back with something like this

PING dropbox.com (108.160.172.232): 56 data bytes

64 bytes from 108.160.172.232: icmp_seq=1 ttl=51 time=19.474 ms

I have about 15 to 20 milli seconds (ms), you are showing few hundreds ms (500). that is definitely not good.

Based on your results you have a Ping (some Internet address) problem while your Internet speed is very good.

Usually that comes from the DNS (Domain name Server), not resolving the Internet address correctly/Fast.

  • First lets clean your DNS cache, just in case something is stuck in there.

Use Terminal and run sudo discoveryutil mdnsflushcache enter your password when asked. Now you should have a clean cache and can start over.

  • Next would be to run a trace route (to Dropbox) to see where is it going and where it takes forever. In Terminal type Traceroute Dropbox.com and wait for it to finish (it takes few moments. The first line is to your router and it should be less the 1 ms (I have 0.7 ms). The following lines are other routes (you can see the names of the servers). I end up with 30ms to the dropbox.

  • Lets carefully check your Network settings step by step.

TCP/IP -Use DHCP

DNS- we discussed that (but take note how many you have in there and what they are)

Proxies- they should be all off

Hardware- Automatic (MTU-Standard 1500)

  • Lets see who is using your Internet. Turn off programs like Mail, Browser, Skype ect. to make that a short list.

Now type lsof -i -P in Terminal and look who is still using your Internet.

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  • With Ping dropbox.com I getRequest timeout for icmp_seq 0 Request timeout for icmp_seq 1 Request timeout for icmp_seq 2 Request timeout for icmp_seq 3 Request timeout for icmp_seq 4 Request timeout for icmp_seq 5 Request timeout for icmp_seq 6 Request timeout for icmp_seq 7 Request timeout for icmp_seq 8 Request timeout for icmp_seq 9 and it goes on – anust May 31 '15 at 19:30
  • OK, "Huston we have a problem" :) – Ruskes May 31 '15 at 19:32
  • Let s try to Ping google. com to test that. – Ruskes May 31 '15 at 19:33
  • With Nettop I don't get any dropbox activity. I uninstalled it. – anust May 31 '15 at 19:34
  • 64 bytes from 173.194.116.5: icmp_seq=0 ttl=54 time=150.194 ms 64 bytes from 173.194.116.5: icmp_seq=1 ttl=54 time=149.015 ms 64 bytes from 173.194.116.5: icmp_seq=2 ttl=54 time=159.272 ms 64 bytes from 173.194.116.5: icmp_seq=3 ttl=54 time=156.921 ms – anust May 31 '15 at 19:35

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