svn: E170013: Unable to connect to a repository at URL 'https://github.com/EinsteinToolkit/ExternalLibraries-HDF5.git/trunk'
svn: E000061: Error running context: Connection refused

svn, version 1.9.4 (r1740329)
   compiled Nov  6 2017, 18:06:35 on x86_64-apple-darwin16.1.0

Copyright (C) 2016 The Apache Software Foundation.
This software consists of contributions made by many people;
see the NOTICE file for more information.
Subversion is open source software, see http://subversion.apache.org/

The following repository access (RA) modules are available:

* ra_svn : Module for accessing a repository using the svn network protocol.
  - handles 'svn' scheme
* ra_local : Module for accessing a repository on local disk.
  - handles 'file' scheme
* ra_serf : Module for accessing a repository via WebDAV protocol using serf.
  - using serf 1.3.8 (compiled with 1.3.8)
  - handles 'http' scheme
  - handles 'https' scheme

The following authentication credential caches are available:

* Plaintext cache in /Users/jonahm/.subversion
* GPG-Agent
* Mac OS X Keychain