The server returned the error: Connections to the server “imap.zoho.com” on the default ports timed out.

The server returned the error: Connections to the server “imap.zoho.com” on the default ports timed out.

I have seen a few other threads and posts in regards to this problem. However, I have not yet come across any long term solution. I will have this issue every now and then and I cannot figure out why it happens when it does. Any help would be greatly appreciated. 

Thank you.