TOAD healthcheck crashes connecting to oracle

hi

i have toad 10.6 trial installed on one of our win temrinal servers, this terminal server has access to remote sites , TOAD can connect to one of the remote sites with no issues.

the second site it can connect to too , I can also run basic select from sql window, however if I try and run the healthckeck or any other GUI interfaces, it all crashes and fails to return any data …

have checked with our network team they think everythink seems ok…

any ideas what it couuld be ?

thanks