Ping ok 503 error
 

Is this from the attack or it is something wrong not working?
Ping to the domain was perfect.

I am under attack syn flood attack

Blocked: Temporary Block

Sample of block hits:
Sep 11 18:09:51 sexy kernel: Firewall: *SYNFLOOD Blocked* IN=eth0 OUT= MAC=00:25:90:4e:30:3e:10:8c:cf:1d:ed:c1:08:00 SRC=49.244.113.248 DST=199.189.111.196 LEN=48 TOS=0x00 PREC=0x00 TTL=104 ID=1416 DF PROTO=TCP SPT=10191 DPT=80 WINDOW=65535 RES=0x00 SYN URGP=0
Sep 11 18:09:51 sexy kernel: Firewall: *SYNFLOOD Blocked* IN=eth0 OUT= MAC=00:25:90:4e:30:3e:40:55:39:06:f3:41:08:00 SRC=49.244.113.248 DST=199.189.111.196 LEN=48 TOS=0x00 PREC=0x00 TTL=104 ID=1420 DF PROTO=TCP SPT=10226 DPT=80 WINDOW=65535 RES=0x00 SYN URGP=0

This is from your firewall (iptables) when its "SYNFLOOD" rule is triggered and logged.

i know my friend has nothing to do but it was related
what about these ?
Ping ok 503 error
Is this from the attack or it is something wrong not working?
Ping to the domain was perfect.
why i was getting 503 error ?

what's the domain in question? that src ip is not our proxy.

YOUR PROXY WAS 68.68.26.33
and my domain
www.example.com

Seems your backend server blocks proxy.

any instructions what to do in this case ?

you need to open firewall (iptables) to allow proxy access to your backend server.

I did but it was still 503,the first thing that i did.

looks ok now.