ADB in Linux: cannot bind 'tcp:5037'

Problem: 

   ./adb start-server
   * daemon not running. starting it now on port 5037 *
   cannot bind 'tcp:5037'
   ADB server didn't ACK
   * failed to start daemon *

Solution #1:

   Kill processes using port 5037

      netstat -ap|grep "5037"

      kill -p 

Solution #2:

   strace ./adb start-server
   ...
   socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 3
   connect(3, {sa_family=AF_INET, sin_port=htons(5037),
   sin_addr=inet_addr("127.0.0.1")}, 16) = -1 ETIMEDOUT (Connection timed out) 

   ==> ifconfig lo up