Failed to download the image, Error Unknown Error

Using: CentOS Linux 7 (Core), 3.10.0-957.21.3.el7.x86_64 with Mono 5.20.1.19 and libgdiplus-devel-5.6-0.xamarin.2

Rust is running with LGSM and set to dev to expand logging.  There are no logs that are created when a person attempts to do /sil . It matters not if the URL is https or HTTP. Images are standard. The JPG and the RAW option was used without any effect. 

So, is there a dev version or something that has verbose logging? 

Happy to post logs I currently have. I do have other mods, and they are working to my knowledge. 

I am also running CentOS 7, slightly lower kernel sub version.  But, I have libgdiplus-2.10-10.el7.x86_64 and mono-core-4.6.2-4.el7.x86_64, mono-web-4.6.2-4.el7.x86_64, et al.

The error you are receiving is from the unity www object.  Not much else for us to look at there as far as I know.  But, can you give me an example of a url you are using.  You say images are standard, but what is the full path/url?  You can message it if you prefer.