There are several KOB servers available at all times. One is actively in use as the primary server, and the others are available as a hot standbys in case the primary server goes down or needs to be taken offline for maintenance. Currently the servers are:
CB server: a Raspberry Pi running at Chip Morgan's home in Millheim, PA
ES server: a virtual Linux instance running on IBM Cloud Services
AC server: a virtual Linux instance running on Amazon Web Services
Before swapping to an alternate server, it's a good idea to try connecting to the new server using MorseKOB 2.5's Tools > Debug screen or MKOB 4.0's 'KOB Server URL' option to specify the server name (e.g., mtc-ac.dyndns.org). This will confirm that (a) the alternate server is running, and (b) its IP address is current in the DynDNS database. Then do the following:
Go to dyndns.com.
Log into the morsekob Dynamic DNS account.
Under Host Services, note the IP address of the desired server (copy with Ctrl-C).
Click on mtc-kob.dyndns.org.
Change the IP Address to that of the desired server (paste with Ctrl-V).
Click on Save Changes.
Click on Log Out.
Notes
Most browsers cache web pages that have been previously viewed, and the Chrome browser even seems to cache the IP address of previous hosts. When you view the KOB server pages after performing a server swap, this can make it seem that the server swap didn't 'take'. Try refreshing the web page or restarting the web browser. As a last resort, try a different web browser or even a different computer.
MorseKOB 2.5 clients don't automatically move to the new server after a swap. MorseKOB 2.5 clients may need to disconnect and reconnect.