Re: [Openvpn-users] OpenVPN 2.4.x cipher negotiation issue: WARNING: INSECURE cipher

2021-04-26 Thread Gert Doering
Hi, On Mon, Apr 26, 2021 at 09:16:39PM +, Marc Lasch via Openvpn-users wrote: > WARNING: INSECURE cipher with block size less than 128 bit (64 bit). This > allows attacks like SWEET32. Mitigate by using a --cipher with a larger > block size (e.g. AES-256-CBC). > > Somehow BF-CBC seems to

[Openvpn-users] OpenVPN 2.4.x cipher negotiation issue: WARNING: INSECURE cipher

2021-04-26 Thread Marc Lasch via Openvpn-users
Hello, I have a rather large installation with 2.4.9 clients connecting to 2.4.4 servers. Servers and clients use the default cipher and ncp-cipher settings which points to BF-CBC and AES-256-GCM:AES-128-GCM respectively, according to the documentation. The cipher negotiation works in most case