We haven't had my recent downtimes on our servers and currently, they are up and running. Could you please let me know what version of Remote Utilities do you use and if your Hosts that are unavailable are located in the networks connected to the Internet via the same ISP?
In addition, please feel free to send us the Host logs which can be located in the following folder: C:\Program Files (x86)\Remote Utilities - Host\Logs\. Please do not publish the logs on the forum as they're considered personal information. You can send the log files to firstname.lastname@example.org.
I've checked with our development department on that day and they've confirmed that there were no downtimes or other issues on our servers. Perhaps, the Hosts that had issues connecting to our servers were affected by some external factors, e.g. firewall or antivirus software activity.
If possible, it would be helpful if you could provide us the Host connection logs for examination as well. The Host log files can be located in the following directory C:\Program Files (x86)\Remote Utilities - Host\Logs\. You can send the log files to email@example.com as well, so I can forward them to our development department.