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Logs

Last Updated: Sep 25, 2018

Logs record the following information:

  • Health check alarm
  • Health check restoration
  • Unavailable address pool information
  • Address pool restoration
  • Access policy exception

Health check alarm

When health check finds that the IP addresses in an address pool are abnormal, relevant information is logged. The logged information includes the exception time, abnormal IP addresses, and error code.
You can identify the cause based on the error code. Common error codes are:

Protocol Status code Description
HTTP 610 Time-out (connection time-out and SSL certificate exchange time-out); time-out period: 30 seconds
HTTP 613 DNS resolution error
HTTP 615 Content mismatch
HTTP 616 Failed authentication
HTTP 611 Failed detection due to other causes
Ping 550 Network unavailable
Ping 610 All sent packets receive no response in 2 seconds despite stable network condition.
Ping 613 Failed IP address resolution based on the host file
TCP 550 Failed to enable the socket. A typical cause is that the system sources have run out.
TCP 610 Failed response reception (time-out or no response)
TCP 611 Failed connection (time-out or rejected by the peer end)
TCP 615 Content mismatch
UDP 550 Failed to enable the socket. A typical cause is that the system sources have run out.
UDP 611 Failed connection (failed resolution based on the host file)
UDP 610 Failed sending or reception
UDP 615 Content mismatch
DNS 610 Failed DNS resolution
DNS 613 DNS query communication error
DNS 615 Content mismatch

Health check restoration

When health check finds that the abnormal IP addresses in an address pool are restored, relevant information is logged. The logged information includes the restoration time and restored IP addresses.

Address pool unavailable

When the number of healthy IP addresses in an address pool is less than the value of Minimum Available Addresses, the address pool is set to Unavailable and relevant information is logged. The logged information includes the specific time, address pool name, and value of Minimum Available Addresses.

Address pool restoration

When the number of healthy IP addresses in an address pool is greater than or equal to the value of Minimum Available Addresses, the address pool is set to Available and relevant information is logged. The logged information includes the specific time, address pool name, and value of Minimum Available Addresses.

Access policy exception

When the default address pool corresponding to an access policy is unavailable, the system switches to the failover address pool and relevant information is logged. The logged information includes the specific time, access policy name, and switchover rule between the default address pool and failover address pool.