Hi,
details:
osticket version: v1.18.1
mail server: Zimbra (own)
I'm having problems authenticating from osticket to my email server, the error "cannot read - connection closed?" as below, I have set the firewall on the osticket and mail server but the error still appears, please help.
![](https://forum.osticket.com/assets/files/2024-04-16/1713269152-11234-image.png)
![](https://forum.osticket.com/assets/files/2024-04-16/1713269177-492164-image.png)
![](https://forum.osticket.com/assets/files/2024-04-16/1713269062-825788-image.png)