Check this Thread: https://www-secure.symantec.com/connect/forums/server-policy-best-practices

Best Practices for Installing Symantec Endpoint Protection (SEP) on Windows Servers

http://www.symantec.com/docs/TECH92440

Best Practices for Symantec Endpoint Protection on Citrix and Terminal Servers

http://www.symantec.com/docs/TECH91070

Default Symantec Endpoint Protection 12.1 RU1 Firewall Policy explanation

http://www.symantec.com/business/support/index?page=content&id=TECH180569&actp=SUBSCRIPTION

How to prepare Symantec Endpoint Protection clients on virtual disks for use with Citrix Provisioning Server

http://www.symantec.com/docs/TECH123419

Check this White Papers - 

Best Practices Client Settings for Symantec Endpoint Protection Version 12.1

https://www-secure.symantec.com/connect/downloads/best-practices-client-settings-symantec-endpoint-protection-version-121

Symantec Endpoint Protection 12.1 Virtualization Best Practices

https://www-secure.symantec.com/connect/downloads/symantec-endpoint-protection-121-virtualization-best-practices

White Paper: Group Update Providers

In reference to MAC clients, check this FAQ - 

Symantec Endpoint Protection for Macintosh Frequently Asked Questions

http://www.symantec.com/docs/TECH134203

SEP 12.1 Best Practice, License & other articles

https://www-secure.symantec.com/connect/articles/sep-121-best-practice-license-other-articles

Best practices  Policies for MAC,

what is SEP firewall behavior when SEP firewall and Windows firewall work parrallel ?

Policies for Firewall, Intrusion Prevention, Application & Device Control will not apply because these components do not exist on the SEP for Mac client.

Only one firewall needs to be activated on WIndows.

what SEP firewall does with pre built customized rules in windows firewall when SEP firewall installs and disable windows firewall ?

Default Symantec Endpoint Protection 12.1 RU1 Firewall Policy explanation

http://www.symantec.com/business/support/index?pag...

what are the best practices for windows servers ?

Best Practices for Installing SEP on Windows Servers

http://www.symantec.com/business/support/index?pag...

thanks for prompt response.

suppose windows firewall is configured with customized rules and we install sep firewall with option disable windows firewall. 

will the customized rules of windows firewall be deactivated or fetched by my sep firewall ?

suppose windows firewall is configured with customized rules and we install sep firewall with option disable windows firewall. 

will the customized rules of windows firewall be deactivated or fetched by my sep firewall ?

SEP client are not disabled windows firewall if you have allow for SEP firewall

Configuring Symantec Endpoint Protection to work with Windows Security Center

http://www.symantec.com/business/support/index?page=content&id=TECH102402&locale=en_US

Check this thread

https://www-secure.symantec.com/connect/forums/windows-firewall-and-sep-both-report-theyre-turned

https://www-secure.symantec.com/connect/forums/sep-12-windows-firewall