Editing CommunityData:Northwestern VPN (section)

=== Troubleshooting ===

New versions of openconnect and openssl can cause a few issues.

==== OpenSSL error ====
If you get an error saying "UNSAFE_RENEGOTIATION DISABLED", this is because our setup relies on Python library that is using an older  deprecated ("unsafe") protocol. Until we get it fixed on the server, you need to disable checking on your local machine.

The simplest thing (described in [https://stackoverflow.com/a/72245418 this stackoverflow suggestion]). Basically, it should be possible to add this line to the following files (after the fourth line): <code>openconnect_command-general.sh</code>, <code>openconnect_command-http.sh</code>, <code>openconnect_command-ssh.sh</code>:

:<code>export OPENSSL_CONF=./openssl.conf</code>

The downside to this is that will require that the command be run ''from the local directory''. Alternatively, you can put the full path to the <code>openssl.conf</code> file that is shipped with the repository into the line above (e.g., <code>/home/mako/bin/nu-vpn-proxy/openssl.conf</code>).

Another option is to change your systemwide OpenSSL configuration as described in comment 7 on [https://bugs.launchpad.net/ubuntu/+source/openssl/+bug/1963834 this bug report]. This is probably more dangerous.

==== Openconnect error ====

The other error that you may get is: <code>Failed to parse server response</code>

If you get this error, it's likely because there was a bug in openconnect. The bug seems to have begun in openconnect 8.2 and been fixed at some point before openconnect 9.0. Basically,that breaks when upgrading to openconnect version 8.20+ but less than 9.0.

If you can upgrade to 9.0, that is best. If you cannot easily do this, it is likely best to downgrade to 8.1.

Instructions for Ubuntu:

1. Uninstall <code>openconnect</code> and <code>libopenconnect5</code>

    sudo apt remove openconnect libopenconnect5

2. Download version 8.10

    cd ~/Some/dir
    wget https://www.infradead.org/openconnect/download/openconnect-8.10.tar.gz
    tar -xvf ./openconnect-8.10.tar.gz
    cd ./openconnect-8.10

3. Install openconnect following [https://www.infradead.org/openconnect/building.html these instructions]

    ./configure
    make
    make install

4. Cross your fingers and try to connect to the VPN again (e.g., with <code>ssh kibo</code>).