FYI, you can see a number of timeouts that happen, this works fine from my own workstation
[error] Server access Error: Connection timed out (Connection timed out) url=https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/org.planet42/laika-pdf_2.12/0.7.5/jars/laika-pdf_2.12.jar
596[error] Server access Error: Connection timed out (Connection timed out) url=https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/com.github.mpilquist/simulacrum_2.12/0.10.0/jars/simulacrum_2.12.jar
597[error] Server access Error: Connection timed out (Connection timed out) url=https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/org.apache.xmlgraphics/batik-xml/1.8/jars/batik-xml.jar
598[error] Server access Error: Connection timed out (Connection timed out) url=https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/com.thesamet.scalapb/protoc-bridge_2.12/0.7.3/jars/protoc-bridge_2.12.jar
599[error] Server access Error: Connection timed out (Connection timed out) url=https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/com.dwijnand/sbt-compat/scala_2.12/sbt_1.0/1.2.6/jars/sbt-compat.jar