HAProxy community

Haproxy Layer 4 time out

Hi , i had been using haproxy (2 servers) from last 2 years with keepalived . suddenly haproxy start throwing layer 4 time out and logs throwing no backend servers unavilable… so that i had to remove complete lb environment. in haproxy stats web servers were continuously flapping normal to critca,critcal to normal… help me on this…