We use cookies on our website to ensure we provide you with the best experience on our website. By using our website, you agree to the use of cookies for analytics and personalized content.This website uses cookies. More Information
It seems like your browser didn't download the required fonts. Please revise your security settings and try again.
Barracuda Load Balancer ADC

How to Enable, Disable, and Maintain Real Servers

  • Last updated on

Disabling your Real Servers allows you to perform maintenance or to temporarily disassociate them from a Service. A Real Server that is in disabled, maintenance, or sticky mode will not accept any new connections or requests until it is enabled.

There are two ways to change the status of a Real Server:

  • Use the Enable, Disable, Maintenance, or Sticky actions on the BASIC > Server Health page.
  • Edit the Real Server on the BASIC > Services page.

If you set the state of a Real Server to Enable, it accepts new requests, connections or sessions.

The following tables describe how servers behave when set in Maintenance, Disable, and Sticky modes depending on the type of service.

Maintenance

ServicesBehavior
Layer 4 TCPExisting connections are handled by the server. No new connections are allowed if either of the following are configured:
  • On the BASIC > Services page, Persistence Type under Load Balancing is set to None (default value).
  • On the ADVANCED > System Configuration page, Disable Maintenance Persistence under Global Settings is set to Yes.
TCP Proxy and Secure TCP ProxyExisting connections are handled by the server. No new connections are allowed.
HTTP, HTTPS, Instant SSLExisting requests and connections are handled by the server. No new requests or connections are allowed.
RDP ProxyExisting connections are handled by the server. No new connections are allowed.
Layer 4 and Layer 7 UDPExisting datagrams continue to reach the server. However, the server is not used for new datagrams.
FTP and FTP SSLExisting and ongoing connections are served by the server. No new connections are allowed.

Disable

ServicesBehavior
Layer 4 TCPService for existing requests and connections is stopped immediately. Connections are closed after the time configured for TCP Connections Timeout on the ADVANCED > System Configuration page under System Settings. No new requests or connections are allowed.
TCP Proxy and Secure TCP ProxyExisting requests and connections are dropped immediately. No new requests or connections are allowed.
HTTP, HTTPS, Instant SSLExisting requests and connections are handled by the server. No new requests or connections are allowed.
RDP ProxyNo new connections are allowed.
Layer 4 UDPThis server is not used for any datagram.
Layer 7 UDPExisting datagrams are handled by the server. The server is not used for new datagrams.
FTP and FTP SSLExisting and ongoing connections are dropped immediately. No new connections are allowed.

Sticky

ServicesBehavior
HTTP, HTTPS, Instant SSL, TCP Proxy, Secure TCP ProxyNew persistence connections are allowed until their persistence timers expire. No new connections are allowed.
FTP and FTP SSLPersistence connections continue to connect to the same server unless the persistence timer has expired. No new connections are allowed.
Last updated on