Hello, I just took a look at the packet dump. The client hello in packet dump is TLS 1.3 the alert sent by server is Alert Message TLS 1.2 could it be that server does not support TLS 1.3? better chance to better understand what's going on is to get hands on the server and get some logs. may be someone else on mailing list will be able to take a look and fill some details which I could miss. thanks and regards sasha On Sat, Jul 13, 2024 at 12:58:07PM +0530, Lokesh Chakka wrote: > Hi, > Please find the attached capture file. > I'm trying to craft a minimal custom client hello packet. I'm seeing > that the contents of the entire packet are proper. But it seems some > more data is missing. Can someone help me understand why the apache2 > server(Ubuntu platform) is sending fatal error. > Thanks & Regards > -- > Lokesh Chakka.