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gdoyle's avatar
Icon for Cirrostratus rankCirrostratus
Dec 19, 2019

TCP Health Check.

All, I have a customer who mentioned that they took a server down for maintenance, but were still receiving customer traffic.   This server sits in a pool tied to a VIP and is load balanced wit...
  • Leonardo_Souza's avatar
    Dec 19, 2019

    TCP monitor will try a TCP handshake, if that is successful, marks pool member up.

    If you use the default TCP monitor, the alias address field is *, that means it will get the port from the pool member.

    So, if pool member is, it will try a TCP handshake with on port 639.


    In the case you described, if the application itself was down, but the server still had the port TCP/639 open, the monitor will still mark the server up.


    You need an application layer monitor.

    The system has a built in LDAP monitor, so you should use that.