[Mono-winforms-list] TLS Invalid Certificate Error when connecting to WebService

[GCHQ]

Attempting to debug a windows app in Mono produces this error when it
attempts to connect to the backend web service

http://mono.1490590.n4.nabble.com/file/n3856100/Mono_001.jpg 

I ran certmg --ssl mysite.com

It found the current certificate (X.509 v3) from Comodo (valid from
16/04/2010 to 30/05/2020) but also appended *** WARNING: Certificate
signature is INVALID ***

It still imported to the CA store and then displayed the company details
(CN=Our Organisation) valid from 16/01/2011 to 16/01/2012 and was
successfully imported into the AddressBook store

Still get the same error when attempting to debug the app in mono

Any ideas what to try next?

Thanks

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