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Lan Sync does not work

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Lan Sync does not work

Im trying to copy my 500GB dropbox to another computer on the same LAN. Ive turned on "Enable LAN Sync" on both dropboxes. There is no (LAN Transfer) message on the download popup, and the files are still being downloaded at regular internet speed from the cloud.

Dropbox help says "The LAN Sync feature requires access to port 17500". This is really not enough information.

Does the uploading computer require access? Do both computers require access? TCP? UDP? How do you set up a home router to allow this access?

Ive tried enabling TCP/UDP port 17500 on each of the 2 LAN computers but nothing changes. Apparently, only 1 computer on a LAN can have a specific port forwarded to it. This seems to be a limitation no matter what router you use.

So, if there is no way to enable access to the same port on 2 computers on the same network. what is the way to enable access? I dont see any option to just generally "open" up a port and allow all computers on the network access to it. I am using a Buffalo router.

Windows Firewall is not blocking either dropbox.

Please tell me- how can I get LAN sync to work?

12 Replies
Level 1

Re: Lan Sync does not work

Lan sync doesnt need any ports forwarded at all, if the port is pinhold through the machines firewall then its fine.
.
What you might be experiencing is that the file must first reach the cloud, then once in the cloud the DB apps see it and start to download it at which time they can request if of the machine that uploaded it to the cloud, instead of the cloud. But it MUST reach the cloud first.
.
Not relevant to you but worth mentioning, Lan sync only works in the same account, LAN sync does not work between accounts with shared folders.

Re: Lan Sync does not work

Hi Dave,

Thanks for taking the time to answer, but It doesnt solve the problem:

  1. In windows firewall for both computers, Dropbox app is already being allowed through with ALL ports being forwarded.
  2. On this dropbox help page [ https://www.dropbox.com/en/help/137 ] it does indeed say that "LAN Sync requires access to TCP port 17500." at the bottom of the advanced section.
  3. The files are already fully synced to the cloud. No additional upload is needed.
  4. Both dropboxes are using the same account.
  5. There are no shared folders.
Level 1

Re: Lan Sync does not work

I would suggest first switching any firewall on the machine off, and any anit virus, and observing if lan sync works, if it does, then its in one of them two or both, or either, so switch one back on, and observe, untill you isolate what it is.
if not ensure the machines can see each other they should be on the same subnet also.

I dont implement anything special and lan sync works.

Re: Lan Sync does not work

Hi Dave,

Thank you for trying to help. Both machines are on the same subnet.

Ive tried completely disabling Windows Firewall and Antivirus on both machines, but there was no change in transfer speed and no message about LAN sync in the status popup.

Level 5

Re: Lan Sync does not work

If its any help I can't get it to work either, no AV running and the windows firewall turned off on both the machines that I want to sync, one has a full copy of everything the other is fresh out of the box vanilla install. Wireshark tells me that requests on 17500 UDP are being sent round but nothing seems to pick up on them.

Level 1

Re: Lan Sync does not work

Hello to everyone. Last May 2015 I have bought 1TB space on DropBox, I started to use it fully. Since that moment I tried to use the "LAN Sync" feature and checked it in many Dropbox I have (in my local LAN and elsewhere). I use only my account and I was never able to use this feature: the speed is my internet connection speed (even if my LAN is a Gigabit one). I tried and re-tried with and without my firewalls (ESET Smart Security) but nothing. Finally I got convinced it doesn't work, simply.

Last week I started again to fix this problem and tried to find some guide on internet, so I arrived here where some people have my problem as well.

 

My LAN is 10.10.10.X (255.255.255.0) and the list of my ports is here:


Active Connections

Proto Local Address Foreign Address State Offload State

TCP 0.0.0.0:111 0.0.0.0:0 LISTENING InHost
TCP 0.0.0.0:135 0.0.0.0:0 LISTENING InHost
TCP 0.0.0.0:445 0.0.0.0:0 LISTENING InHost
TCP 0.0.0.0:554 0.0.0.0:0 LISTENING InHost
TCP 0.0.0.0:2049 0.0.0.0:0 LISTENING InHost
TCP 0.0.0.0:2869 0.0.0.0:0 LISTENING InHost
TCP 0.0.0.smiling face with halo389 0.0.0.0:0 LISTENING InHost
TCP 0.0.0.0:4242 0.0.0.0:0 LISTENING InHost
TCP 0.0.0.0:5357 0.0.0.0:0 LISTENING InHost
TCP 0.0.0.0:10243 0.0.0.0:0 LISTENING InHost
TCP 0.0.0.0:17500 0.0.0.0:0 LISTENING InHost
TCP 0.0.0.0:26143 0.0.0.0:0 LISTENING InHost
TCP 0.0.0.0:49152 0.0.0.0:0 LISTENING InHost
TCP 0.0.0.0:49153 0.0.0.0:0 LISTENING InHost
TCP 0.0.0.0:49154 0.0.0.0:0 LISTENING InHost
TCP 0.0.0.0:49160 0.0.0.0:0 LISTENING InHost
TCP 0.0.0.0:49161 0.0.0.0:0 LISTENING InHost
TCP 10.10.10.17:139 0.0.0.0:0 LISTENING InHost
TCP 10.10.10.17:49925 54.192.26.8:443 CLOSE_WAIT InHost
TCP 10.10.10.17:49926 45.58.74.161:443 CLOSE_WAIT InHost
TCP 10.10.10.17:49927 54.210.96.26:443 CLOSE_WAIT InHost
TCP 10.10.10.17:49928 45.58.74.161:443 CLOSE_WAIT InHost
TCP 10.10.10.17:49929 108.160.172.193:443 CLOSE_WAIT InHost
TCP 10.10.10.17:49930 45.58.70.1:443 CLOSE_WAIT InHost
TCP 10.10.10.17:49931 45.58.74.1:443 CLOSE_WAIT InHost
TCP 10.10.10.17:49952 108.160.167.180:443 ESTABLISHED InHost
TCP 10.10.10.17:49978 52.3.98.81:443 CLOSE_WAIT InHost
TCP 10.10.10.17:50000 198.252.206.25:443 ESTABLISHED InHost
TCP 10.10.10.17:50189 54.192.26.8:443 CLOSE_WAIT InHost
TCP 10.10.10.17:50190 216.58.210.238:443 ESTABLISHED InHost
TCP 10.10.10.17:50191 216.58.217.195:443 ESTABLISHED InHost
TCP 10.10.10.17:61257 158.85.224.174:443 ESTABLISHED InHost
TCP 10.10.10.17:62272 54.243.220.3:443 CLOSE_WAIT InHost
TCP 10.10.10.17:62273 23.23.170.132:443 CLOSE_WAIT InHost
TCP 10.10.10.17:62506 208.80.53.10smiling face with halo4826 ESTABLISHED InHost
TCP 10.10.10.17:65137 10.10.10.2smiling face with halo389 ESTABLISHED InHost
TCP 10.10.10.17:65139 108.160.172.225:443 CLOSE_WAIT InHost
TCP 10.10.10.17:65165 54.85.141.221:443 CLOSE_WAIT InHost
TCP 10.10.10.17:65176 54.192.26.8:443 CLOSE_WAIT InHost
TCP 10.10.10.17:65177 45.58.70.1:443 CLOSE_WAIT InHost
TCP 10.10.10.17:65178 45.58.70.1:443 CLOSE_WAIT InHost
TCP 10.10.10.17:65179 45.58.70.1:443 CLOSE_WAIT InHost
TCP 10.10.10.17:65180 45.58.70.1:443 CLOSE_WAIT InHost
TCP 10.10.10.17:65231 52.7.208.34:443 CLOSE_WAIT InHost
TCP 10.10.10.17:65257 54.192.26.8:443 CLOSE_WAIT InHost
TCP 10.10.10.17:65305 108.160.172.238:443 ESTABLISHED InHost
TCP 127.0.0.1:843 0.0.0.0:0 LISTENING InHost
TCP 127.0.0.1:4370 0.0.0.0:0 LISTENING InHost
TCP 127.0.0.1:4380 0.0.0.0:0 LISTENING InHost
TCP 127.0.0.1:5354 0.0.0.0:0 LISTENING InHost
TCP 127.0.0.1:5354 127.0.0.1:49155 ESTABLISHED InHost
TCP 127.0.0.1:5354 127.0.0.1:49156 ESTABLISHED InHost
TCP 127.0.0.1:5939 0.0.0.0:0 LISTENING InHost
TCP 127.0.0.1:17600 0.0.0.0:0 LISTENING InHost
TCP 127.0.0.1:19872 127.0.0.1:49243 ESTABLISHED InHost
TCP 127.0.0.1:27015 0.0.0.0:0 LISTENING InHost
TCP 127.0.0.1:27015 127.0.0.1:49231 ESTABLISHED InHost
TCP 127.0.0.1:43227 0.0.0.0:0 LISTENING InHost
TCP 127.0.0.1:49155 127.0.0.1:5354 ESTABLISHED InHost
TCP 127.0.0.1:49156 127.0.0.1:5354 ESTABLISHED InHost
TCP 127.0.0.1:49231 127.0.0.1:27015 ESTABLISHED InHost
TCP 127.0.0.1:49243 127.0.0.1:19872 ESTABLISHED InHost
TCP 127.0.0.1:49276 127.0.0.1:49277 ESTABLISHED InHost
TCP 127.0.0.1:49277 127.0.0.1:49276 ESTABLISHED InHost
TCP 192.168.56.1:139 0.0.0.0:0 LISTENING InHost
TCP [:slightly smiling face:135 [:slightly smiling face:0 LISTENING InHost
TCP [:slightly smiling face:445 [:slightly smiling face:0 LISTENING InHost
TCP [:slightly smiling face:554 [:slightly smiling face:0 LISTENING InHost
TCP [:slightly smiling face:2869 [:slightly smiling face:0 LISTENING InHost
TCP [:slightly smiling face:3389 [:slightly smiling face:0 LISTENING InHost
TCP [:slightly smiling face:5357 [:slightly smiling face:0 LISTENING InHost
TCP [:slightly smiling face:10243 [:slightly smiling face:0 LISTENING InHost
TCP [:slightly smiling face:26143 [:slightly smiling face:0 LISTENING InHost
TCP [:slightly smiling face:49152 [:slightly smiling face:0 LISTENING InHost
TCP [:slightly smiling face:49153 [:slightly smiling face:0 LISTENING InHost
TCP [:slightly smiling face:49154 [:slightly smiling face:0 LISTENING InHost
TCP [:slightly smiling face:49160 [:slightly smiling face:0 LISTENING InHost
TCP [:slightly smiling face:49161 [:slightly smiling face:0 LISTENING InHost
TCP [::1]:49169 [:slightly smiling face:0 LISTENING InHost
UDP 0.0.0.0:500 *:*
UDP 0.0.0.smiling face with halo702 *:*
UDP 0.0.0.smiling face with halo702 *:*
UDP 0.0.0.smiling face with halo702 *:*
UDP 0.0.0.smiling face with halo702 *:*
UDP 0.0.0.0:4500 *:*
UDP 0.0.0.0:5004 *:*
UDP 0.0.0.0:5005 *:*
UDP 0.0.0.0:5355 *:*
UDP 0.0.0.0:17500 *:*
UDP 0.0.0.0:50371 *:*
UDP 0.0.0.0:55247 *:*
UDP 0.0.0.0:55249 *:*
UDP 0.0.0.0:55307 *:*
UDP 0.0.0.0:61109 *:*
UDP 0.0.0.0:62884 *:*
UDP 10.10.10.17:137 *:*
UDP 10.10.10.17:138 *:*
UDP 10.10.10.17:1900 *:*
UDP 10.10.10.17:2177 *:*
UDP 10.10.10.17:5353 *:*
UDP 10.10.10.17:5353 *:*
UDP 10.10.10.17:61913 *:*
UDP 127.0.0.1:1900 *:*
UDP 127.0.0.1:55245 *:*
UDP 127.0.0.1:55246 *:*
UDP 127.0.0.1:55305 *:*
UDP 127.0.0.1:55306 *:*
UDP 127.0.0.1:61915 *:*
UDP 192.168.56.1:137 *:*
UDP 192.168.56.1:138 *:*
UDP 192.168.56.1:1900 *:*
UDP 192.168.56.1:2177 *:*
UDP 192.168.56.1:5353 *:*
UDP 192.168.56.1:5353 *:*
UDP 192.168.56.1:61914 *:*
UDP [:slightly smiling face:500 *:*
UDP [:slightly smiling face:3702 *:*
UDP [:slightly smiling face:3702 *:*
UDP [:slightly smiling face:3702 *:*
UDP [:slightly smiling face:3702 *:*
UDP [:slightly smiling face:4500 *:*
UDP [:slightly smiling face:5004 *:*
UDP [:slightly smiling face:5005 *:*
UDP [:slightly smiling face:5355 *:*
UDP [:slightly smiling face:50372 *:*
UDP [:slightly smiling face:55248 *:*
UDP [:slightly smiling face:55250 *:*
UDP [:slightly smiling face:55308 *:*
UDP [:slightly smiling face:62885 *:*
UDP [::1]:1900 *:*
UDP [::1]:5353 *:*
UDP [::1]:5353 *:*
UDP [::1]:61912 *:*
UDP [fe80::798a:b367:dace:c0f2%19]:1900 *:*
UDP [fe80::798a:b367:dace:c0f2%19]:2177 *:*
UDP [fe80::798a:b367:dace:c0f2%19]:61911 *:*

 ----------

TCP 0.0.0.0:111 0.0.0.0:0 LISTENING
TCP 0.0.0.0:135 0.0.0.0:0 LISTENING
TCP 0.0.0.0:445 0.0.0.0:0 LISTENING
TCP 0.0.0.0:554 0.0.0.0:0 LISTENING
TCP 0.0.0.0:2049 0.0.0.0:0 LISTENING
TCP 0.0.0.0:2869 0.0.0.0:0 LISTENING
TCP 0.0.0.smiling face with halo389 0.0.0.0:0 LISTENING
TCP 0.0.0.0:4242 0.0.0.0:0 LISTENING
TCP 0.0.0.0:5357 0.0.0.0:0 LISTENING
TCP 0.0.0.0:10243 0.0.0.0:0 LISTENING
TCP 0.0.0.0:17500 0.0.0.0:0 LISTENING
TCP 0.0.0.0:26143 0.0.0.0:0 LISTENING
TCP 0.0.0.0:49152 0.0.0.0:0 LISTENING
TCP 0.0.0.0:49153 0.0.0.0:0 LISTENING
TCP 0.0.0.0:49154 0.0.0.0:0 LISTENING
TCP 0.0.0.0:49160 0.0.0.0:0 LISTENING
TCP 0.0.0.0:49161 0.0.0.0:0 LISTENING
TCP 10.10.10.17:139 0.0.0.0:0 LISTENING
TCP 127.0.0.1:843 0.0.0.0:0 LISTENING
TCP 127.0.0.1:4370 0.0.0.0:0 LISTENING
TCP 127.0.0.1:4380 0.0.0.0:0 LISTENING
TCP 127.0.0.1:5354 0.0.0.0:0 LISTENING
TCP 127.0.0.1:5939 0.0.0.0:0 LISTENING
TCP 127.0.0.1:17600 0.0.0.0:0 LISTENING
TCP 127.0.0.1:27015 0.0.0.0:0 LISTENING
TCP 127.0.0.1:43227 0.0.0.0:0 LISTENING
TCP 192.168.56.1:139 0.0.0.0:0 LISTENING
TCP [:slightly smiling face:135 [:slightly smiling face:0 LISTENING
TCP [:slightly smiling face:445 [:slightly smiling face:0 LISTENING
TCP [:slightly smiling face:554 [:slightly smiling face:0 LISTENING
TCP [:slightly smiling face:2869 [:slightly smiling face:0 LISTENING
TCP [:slightly smiling face:3389 [:slightly smiling face:0 LISTENING
TCP [:slightly smiling face:5357 [:slightly smiling face:0 LISTENING
TCP [:slightly smiling face:10243 [:slightly smiling face:0 LISTENING
TCP [:slightly smiling face:26143 [:slightly smiling face:0 LISTENING
TCP [:slightly smiling face:49152 [:slightly smiling face:0 LISTENING
TCP [:slightly smiling face:49153 [:slightly smiling face:0 LISTENING
TCP [:slightly smiling face:49154 [:slightly smiling face:0 LISTENING
TCP [:slightly smiling face:49160 [:slightly smiling face:0 LISTENING
TCP [:slightly smiling face:49161 [:slightly smiling face:0 LISTENING
TCP [::1]:49169 [:slightly smiling face:0 LISTENING

----------

TCP 10.10.10.17:49952 108.160.167.180:443 ESTABLISHED
TCP 10.10.10.17:50000 198.252.206.25:443 ESTABLISHED
TCP 10.10.10.17:50200 192.0.80.241:443 ESTABLISHED
TCP 10.10.10.17:50201 93.184.220.17:443 ESTABLISHED
TCP 10.10.10.17:50203 216.58.210.227:443 ESTABLISHED
TCP 10.10.10.17:50206 93.184.220.17:443 ESTABLISHED
TCP 10.10.10.17:50207 93.184.220.17:443 ESTABLISHED
TCP 10.10.10.17:50208 93.184.220.17:443 ESTABLISHED
TCP 10.10.10.17:50209 93.184.220.17:443 ESTABLISHED
TCP 10.10.10.17:50210 93.184.220.17:443 ESTABLISHED
TCP 10.10.10.17:50211 74.125.133.95:443 ESTABLISHED
TCP 10.10.10.17:50212 93.184.220.110:443 ESTABLISHED
TCP 10.10.10.17:50213 192.0.77.2:443 ESTABLISHED
TCP 10.10.10.17:61257 158.85.224.174:443 ESTABLISHED
TCP 10.10.10.17:62506 208.80.53.10smiling face with halo4826 ESTABLISHED
TCP 10.10.10.17:65137 10.10.10.2smiling face with halo389 ESTABLISHED
TCP 10.10.10.17:65305 108.160.172.238:443 ESTABLISHED
TCP 127.0.0.1:5354 127.0.0.1:49155 ESTABLISHED
TCP 127.0.0.1:5354 127.0.0.1:49156 ESTABLISHED
TCP 127.0.0.1:19872 127.0.0.1:49243 ESTABLISHED
TCP 127.0.0.1:27015 127.0.0.1:49231 ESTABLISHED
TCP 127.0.0.1:49155 127.0.0.1:5354 ESTABLISHED
TCP 127.0.0.1:49156 127.0.0.1:5354 ESTABLISHED
TCP 127.0.0.1:49231 127.0.0.1:27015 ESTABLISHED
TCP 127.0.0.1:49243 127.0.0.1:19872 ESTABLISHED
TCP 127.0.0.1:49276 127.0.0.1:49277 ESTABLISHED
TCP 127.0.0.1:49277 127.0.0.1:49276 ESTABLISHED

 

So, can you explain us why it doesn't work?

 

Best regards.

Elio

Level 3

Re: Lan Sync does not work

Me too!

Level 1

Re: Lan Sync does not work

Dear Sirs,

 

on December 05, 2015 at 17:06 (almost two months ago) I have put a detailed question (see above here) still ignored.

 

Why do you have such unfair behavior?

 

Best regards,

Elio Matacena.

 

Level 2

Re: Lan Sync does not work

Guys, I've been tearing my hair out too with this issue. The following worked for me:

  1. Restart your Windows PC into Safe Mode.
  2. Start dropbox (it won't start automatically).
  3. When dropbox has started, turn off LAN Sync.
  4. Close the Dropbox preferences window.
  5. Let dropbox save those settings: might take a minute or two.
  6. Open the dropbox preferences again, turn on LAN Sync.
  7. Close the preferences box again.
  8. And let dropbox save the settings.
  9. Now, restart Windows again, normally. 

Any joy?