System Hung After "TCP: too many of orphaned sockets" and "Out of socket memory" Errors

Solution Verified - Updated -


  • System was forced offline after being unresponsive to logins. Inspection of log entries prior to the forced reboot show an ever increasing number of the following messages.
    • kernel: TCP: too many of orphaned sockets
    • kernel: Out of socket memory
    • login: FATAL: bad tty


  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5
  • Improperly customized net.ipv4.tcp_mem sysctl

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase of over 48,000 articles and solutions.

Current Customers and Partners

Log in for full access

Log In