I had that problem and works for me now, I didn't do anything special, I just restarted computer i mean i wasn't playing for like 3 hours then it worked. Maybe copy Silkroad folder and run it in copy of Silkroad. I did that too. But I don't think thats something that should help.
[4]. A¢¼O ½CÆÐ9 Error / C9 Error This error occurs when the client cannot connect to the agent server. This happens most commonly when your firewall program does not allow access to Silkroad, or interferes with the running of the Silkroad client. Please check your firewall settings. If you do not have a personal firewall program installed, it may be a firewall program used by your ISP Internet Service Provider. Please contact your ISP service. If you are using a router with a firewall, you need to configure your firewall settings to allow Silkroad. 1 Check firewall settings. 2 Sro_client.exe, silkroad.exe, Gameguard.des must all be permitted to access the internet.
IGN Baby_N00b
Server: Venice
Guild: GodLike_
Union: N/A
Status: Freed From Farming At Last!
Ye i checked the official first. I have absolutely no firewall protection, all turned of. Iv granted acsess to all gameguard.exe and sro.exe. And like the others this only happens straight after tuesdays update.