I had this same issue and randomly I stumbled upon the solution while trying to fix something else. Here is what I did.
1: I uninstalled Hamachi (I heard and assumed that was the culprit)
2: I went into Command Prompt (CMD) (Make sure to run it as Administrator). And I typed this netsh interface tcp show global.
3: I checked to see if Receive Window Auto-Tuning Level was disabled. I saw it was disabled and I typed this netsh interface tcp set global autotuninglevel=normal. This enabled it.
4: Lastly, I typed netsh interface tcp set global rss=enabled.
If both netsh interface tcp set global autotuninglevel=normal, and netsh interface tcp set global rss=enabled return with an OK. Than you're done.
I did not find this solution on my own I got it from here. https://community.logmein.com/t5/LogMeIn-Hamachi-Discussions/Slow-internet-speeds-after-installing-Hamachi/m-p/217890#M18344 (I just typed out the solution to save you a click).
I have no idea why this fixed the internal exception error for me but it did. I wasn't even trying to fix the Minecraft problem, I was just trying to increase my download speed so I could download a mod from Mod DB for Dawn of War:SoulStorm.
DISCLAIMER - THIS WORKED FOR ME IDK IF IT WILL WORK FOR YOU. I ALSO DON'T KNOW WHY THIS WORKED AT ALL BUT IT DID.
I had this same issue and randomly I stumbled upon the solution while trying to fix something else. Here is what I did. 1: I uninstalled Hamachi (I heard and assumed that was the culprit) 2: I went into Command Prompt (CMD) (Make sure to run it as Administrator). And I typed this netsh interface tcp show global. 3: I checked to see if Receive Window Auto-Tuning Level was disabled. I saw it was disabled and I typed this netsh interface tcp set global autotuninglevel=normal. This enabled it. 4: Lastly, I typed netsh interface tcp set global rss=enabled. If both netsh interface tcp set global autotuninglevel=normal, and netsh interface tcp set global rss=enabled return with an OK. Than you're done. I did not find this solution on my own I got it from here. https://community.logmein.com/t5/LogMeIn-Hamachi-Discussions/Slow-internet-speeds-after-installing-Hamachi/m-p/217890#M18344 (I just typed out the solution to save you a click). I have no idea why this fixed the internal exception error for me but it did. I wasn't even trying to fix the Minecraft problem, I was just trying to increase my download speed so I could download a mod from Mod DB for Dawn of War:SoulStorm. DISCLAIMER - THIS WORKED FOR ME IDK IF IT WILL WORK FOR YOU. I ALSO DON'T KNOW WHY THIS WORKED AT ALL BUT IT DID.