KB16328: How to enable and configure "Keep Alive" options for various operating systems in MicroStrategy Web Universal 9.x

INTRODUCTION:
The KeepAlive or HTTP persistent connection setting is a connection setting that causes the TCP socket to periodically a signal the connection from being closed due to appearing as idle. This setting is particularly useful for TCP connections that must pass through a firewall, which might proactively close connections that it determines to be idle. Below are the instructions on enabling the Keep-Alive setting for various operating systems. For more information on the Keep-Alive or persistent Connection setting, refer to the Microsoft article here:
 
Things that you may want to know about TCP Keepalives
 
ENABLING KEEPALIVE IN WINDOWS OS

1. Launch the registry and navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
2. Create a new REG_DWORD value named KeepAliveInterval and set the value of the interval value (milliseconds). For example, 15000 for 15 seconds.
3. Create a new REG_DWORD value named KeepAliveTime and set the value to the number of milliseconds to wait before sending a KeepAlive packet. The default value is 2 hours or 7200000 milliseconds.
4. Restart the system.

Registry Modification Warning: Modifying registry values incorrectly may cause serious, system-wide problems that may require the re-installation of Microsoft Windows NT. Any edit of the registry is done at the user`s own risk. Since these are user-initiated changes, they are not covered by any Strategy warranty. If using Microsoft Windows NT, the user should backup the registry and/or update an Emergency Repair Disk (ERD) prior to alterations.
 
ENABLING KEEPALIVE IN SOLARIS OS
From the root account, use the ndd command to set the Keep-Alive interval value (milliseconds): 

1. 
   ndd -set /dev/tcp tcp_keepalive_interval 15000

   
   

Restart the system. To permanently change the value, the command will need to be set while the system is starting by modifying a startup script (e.g. /etc/rc ….)
 
ENABLING KEEPALIVE IN LINUX OS

1. From the root account, use the following command to set the wait time (seconds) between the isAlive interval probes:
   

   
   echo 15 > /proc/sys/net/ipv4/tcp_keepalive_intvl

   
   
2. To set the number of probes before timing out, use the following command to set the value (seconds):
   

   
   echo 5 > /proc/sys/net/ipv4/tcp_keepalive_probes

   
   
3. Restart the system. To permanently change the values, the commands will need to be set while the system is starting by modifying a startup script (e.g. /etc/rc ….)

 
ENABLING KEEPALIVE IN HP-UX 

1. From the root account, use thendd command to set the Keep-Alive interval value (milliseconds):
   

   
   ndd -set /dev/tcp tcp_keepalive_interval 15000

   
   
2. To set the maximum number of times to probe before dropping, use the following command to set the value (milliseconds):
   

   
   ndd -set /dev/tcp tcp_keepalive_kill 5000

   
   
3. Restart the system. To permanently change the values, the commands will need to be set while the system is starting by modifying a startup script (e.g. /etc/rc ….)

 
ENABLING KEEPALIVE IN AIX 

1. From the root account, use the no command to set the Keep-Alive interval value (half seconds):
   

   
   no -o tcp_keepidle=30

   
   
2. To set the interval between packets that are sent to keep the connection valid, use the following command to set the value (half seconds):
   

   
   no -o tcp_keepintvl=10

   
   
3. Restart the system. To permanently change the values, the commands will need to be set while the system is starting by modifying a startup script (e.g. /etc/rc ….)