This feed throws a Timeout 505 error in Newsblur:
https://www.scala-lang.org/feed/blog.xml
Fetching the feed on my computer seems to be pretty fast, under 1 second, so this feels like a networking problem between Newsblur and that server:
$ time curl -v "https://www.scala-lang.org/feed/blog.xml" >/dev/null
< HTTP/1.1 200 OK
....
curl -v "https://www.scala-lang.org/feed/blog.xml" > /dev/null 0.01s user 0.01s system 6% cpu 0.454 total
Note that triggering “Fetch feed from Website” (Blog | The Scala Programming Language) also throws an error, and it shouldn’t.
Screenshot: