My devstack installation was failing with an error reported by the GnuTLS module as shown below: $ git clone https://github.com/openstack/horizon.git /opt/stack/horizon --branch master Cloning into '/opt/stack/horizon'... remote: Counting objects: 154213, done. remote: Compressing objects: 100% (11/11), done. error: RPC failed; curl 56 GnuTLS recv error (-9): A TLS packet with unexpected length was received. fatal: The remote end hung up unexpectedly fatal: early EOF fatal: index-pack failed The following Git config changes fixed the issue for me. Am hoping it will be useful for someone out there: $ git config http.sslVerify false $ git config --global http.postBuffer 1048576000
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