my instance can ping outside but not able to curl/wget/telnet

Hi there,

got a SOS issue , its really wired here ,

all the instance in my vpc/subnet just not able to access internet , i can ssh to the instance via public ip , can do ping google.com and ping 8.8.8.8 but can not use curl/wget/telnet to access any website,

when i start a new instance , it was working, but after few minutes its not working again , i have checked everything include , firewall, vpc, subnet, security group, network acl, route table, internet gateway , even swicth to another vpc still not working ... also i have run that network reachable analysis tool , show everything ok .....

please help me

thanks