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H4X0R46's avatar
H4X0R46
New Contributor
5 years ago

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?

Problem
  • oyvindhauge's avatar
    oyvindhauge
    5 years ago

    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.

  • acid78's avatar
    acid78
    Visitor
    3 years ago
     
    Hello
I installed Hamachi on both of my PCs ( both Win10).
Unfortunately I now have the problem that my upload speed is very slow.
Normally I have 50mbit upload but after installation I only have 3-5mbit upload.
The effect happened right after installation.
Nothing else was changed in the system.

What can I do ???
  • v4n's avatar
    v4n
    New Member
    3 years ago

    very late reply, but this is how to fix it:

    1. uninstall hamachi using the uninstaller that it has.
    2. press Win + R and something should pop up on the bottom left of your screen

    3. type in ctfmon.exe and hit enter.
    4. restart your computer and redo step 2 and it will be fixed.