Fernando,
I have zero experience of your remote environment, however perhaps you
could try initially connecting direct with Remmina/FreeRDP (pref the
same version as you're using for Guacamole)?
If that works then try Guacamole again, specifically disabling all the
caching options. It may also be worth experimenting with some different
display settings (eg. true colour etc).
If perchance a direct FreeRDP connection doesn't work I suspect
Guacamole won't either, until whatever impediment is resolved. However
in that instance it should narrow things down somewhat and hopefully
make it a little easier to resolve.
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