I am not finding that tool - When I goto MiVoice Border Gateway the options at the top I have are System Status, Service Configuration, System Configuration, and Administration. Under Administration there is Diagnostics, but no Teleworker Network Analyzer. Before the cert failed the system had been operational.
That being said I did some additional playing and tried to uninstall the cert and reinstall it. I noticed when I uninstalled the cert the Web Server seems to keep another cert that states it is good till 2031 almost looks like a self signed but instead of just having the aws.domain.com it also has *.domain.com, aws, domain.com, Internal IP, and External IP listed for Alternate names. The cert is not valid when trying to connect from a browser but with a browser I can log into MiCollab if I bypass the cert error. I still get the same error on the Micollab client. I'm going to do a new CSR and try to start from scratch see if that helps.