WARNING: cipher with small block size in use, reducing reneg-bytes to 64MB to mitigate SWEET32 attacks.

[Tams]

I'm trying to connect to my university's VPN by loading a config file linked with a certificate, however when I try to connect to the vpn it says that I cannot connect due to this warning: WARNING: cipher with small block size in use, reducing reneg-bytes to 64MB to mitigate SWEET32 attacks.   How can I solve?   It's very important 

Thanks a lot

[Tunnelblick developer]

This is a warning from OpenVPN. You need to update your OpenVPN configurations (on both the server and client) to use a different, more modern cipher. See Tunnelblick Support for links to sources of help for OpenVPN.

Or, if you have one, contact your VPN service provider. That is the organization which gave you your configuration files, and perhaps a username and password, and to which you may be paying a fee for VPN service. For more information, please see Getting VPN Service.

Tunnelblick is just the free software that many VPN service providers recommend or supply to their customers. We do not provide VPN service, just software.