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Slow internet speeds after installing Hamachi
I've been having this issue for so long now! For some reason, my internet is blazing fast until I install Hamachi. Certain website downloads are affected but others aren't. for instance, downloading a zip file from "downloads.oneplus.com" WITHOUT Hamachi shows 3 minutes left. AFTER installing Hamachi, that same file now says 20 Minutes.... Same issue happens with Microsoft's download servers, when trying to download the Windows 10 iso, Hamachi just DESTROYS the download speed when my internet is more than capable of downloading large files quickly!
Even uninstalling Hamachi leaves the same affect, almost like there's something left in the system that causes this, registry data maybe? Any pointers?
Try this to check the status of Receive Window Auto-Tuning Level
netsh interface tcp show global
and if it is disabled, turn it on with
netsh interface tcp set global autotuninglevel=normal
This helped me and two mates. The settings need to be run with admin rights cmd (and shift+ctrl when you run it).
As far as we understand it you would most likely want Receive-Side Scaling State enabled as well.
netsh interface tcp set global rss=enabled
We have not tested Hamachi after changing these settings. Nevertheless, just wanted to share because this problem was making us crazy.
61 Replies
Hello,
I have two offices at different locations and I use Hamachi to share network between them. Both of this offices have pretty good internet connection 100/100 FTTH. Unfortunately transfer speeds using Windows explorer are not more than 900 Kb/s. Connection is green - "direct tunnel".
What could we do about that?
Thank you!
The solution works great and my download speed is back to normal, BUT I still have the same problem with my UPLOAD SPEED. Any news about how to fix UPLOAD SPEED too?
Hi,
I tried out Hamachi and noticed it slows down my internet, even when not connected.
I found the fix, for this which sorted out my download speeds, but would like to know:
Is it a 1 time fix or do I need to keep doing it?
Thanks
This worked perfectly 😃
I worked for me too, thanks a lot but the upload speed got cut in about half after I applied the netsh commands. If there is a fix for this asw please tell us, if not i guess we`ll just have to wait for the next update.
Thanks 🙂
Glad our technical investigations were of help to others 🙂
I think Hamachi are aware. One of my mates also posted the problem/solution on the forums, and if I remember correctly, he got an answer from one of the Hamachi employees stating they would fix it in some upcoming release. I believe, this was a few weeks ago (and pretty long after we posted).
But my Upload is still slow since i installed Hamachi, what can fix this?
You are my Hero, finally i found the issue after i already reinstalled windows!
But my Upload is still broken, should be on 50 Mbps and its on 10Mbps - any solving on this?
We need to bring this information to Hamachi, it caused on both of my installations this issue!
THANKS!- Hi everyone,
The solution works great for me and my download speed is back to normal, BUT I still have the same problem with my UPLOAD SPEED. Same as occurred with download speed after installing Hamachi the upload speed is down to half of normal speed.
I think there be similar CMD netsh commands to restore upload speed. Can you help me with this? Hi everyone,
I apologize for the delays, and expect the next version to have native API calls instead of netsh background configurations. Until that time (as mentioned previously), you can run the following commands to resolve:
netsh int tcp set global autotuninglevel=normal
+netsh int tcp set global rss=enabled
