CentOS 7.x teamviewer

CentOS 7.x teamviewer not starting issue

If teamviewer is not starting (shows red color unable to connect at bottom) then try

   systemctl restart teamviewerd

This is important in case of laptops resumes after suspend where wifi connection is stopped and reconnected.

To solve teamviewer commercial use detected issue on Linux use:

Start teamviewer and note your ID
systemctl stop teamviewerd
Note ethernet MAC of primary interface using:
```
ifconfig -a
```
Change MAC using:
```
ifconfig enp0s25 hw ether <new-MAC>
```
Note that second last hexadecimal character in unicast (machine) MAC cannot be even (0, 2, ..., f, etc.).
systemctl start teamviewerd
Start teamviewer and note ID again. If steps are successful a new ID will be shown without commercial use detected issue.

Refer: