Hello again.
I set the curl settings properly. But problem is still on. Now ticker cache files are not even being downloaded to server library(previously cache files were being created but with 0 kb size)
I am trying to overcome the issue with using another template for ticker (which doesnt download the images but directly connects to the rss feed.) İ created a template json file for my custom view (accordingly to this guide Creating Ticker Templates using "Override Template") and verified all modules. But cant see the template for ticker under appearance tab.