Connection Could not Be Established. Reason Unknown.

DinoA

I having this issue where i will not connect, been using for 5 years now it wont connect.

GordonM

I had same issue - due to change of ID's on remote machines. As of today I have confirmed that rebooting the remote machines makes the 50% that were showing offline show online again, but these ones still say "A connection could not be established. Reason Unknown." Have tried logging out of TV and back in but no change.

ManuHernz

What easily worked for me was to UNISTALL Teamviewer from one of my computers, without unistalling settings or preferences, then REINSTALL it...!

manohoo

Rebooting both PCs did not work for me. However, I made it work by killing all teamviewer services (This PC->Manage, Services...) on the local PC, then start Teamviewer as usual.

igor_cipi

Xander2333

I met this issue too. I solved it by updating Teamviewer. The problem for me is I used an outdated version. 

Segah

I am facing this problem as well. Hence I wasn't able to find any working methods from this topic, I googled a lot and I updated the teamviewer version as mentioned in this article to match with the version of the teamviewer with the other person. This is the link (https://forumbap.com/t/teamviewer-cant-connect-reason-unknown/1374/). I was able to solve the issue for a couple of days...

From yesterday, the same issue came back, and I couldn't resolve it with any of the methods mentioned here or on any article on the internet. So, can any of your support guys tell me what could I do? Please help me. I would greatly appreciate it. I have been trying fixes for almost 2 whole days now.

Goico

To fix that problem, only you need Update your Teamviewer and your partner too.

Poiseon2

Thanks, @Goico ! That worked for me. Updating the TeamViewer app worked!

DinoA

My License has expired and I'm trying to repurchase but don't know where to go to purchase it?