Microsoft outlook 2010 not working after installing proxy server and ForeFront TMG firewall

I am trying to have Outlook 2010 work though proxy server recently installed on internal network, I have configured IE to use the proxy settings, but I cannot find the
same with Outlook 2010, I want to clarify that we use Outlook 2010 to connect to internet email and we installed ForeFront TMG firewall on the proxy server and as a result of that we changed the IP settings and after that Outlook stopped sending and receiving
mails and gives error: “receiving reported error (0x800408fc): 'The Server name you entered cannot be found (it might be down temporarily).”
So please help us by sharing how to fix this issue to make Outlook work though proxy server
Thanks

Hi,
Are you using Exchange account? If you are changing your Exchange account to use a proxy server, I suggest we can create new profile and automatically re-configuring your account with autodiscover service to have a try:
http://support.microsoft.com/kb/829918
If the account can’t be configured automatically, please manually configure the account and change the settings for procy server:
1. In the Account Settings dialog box, click the
Email tab, click to select the Exchange account, and then click
Change.
2. Click More Settings. On the Connections tab, click
Exchange Proxy Settings.
3. In Connection settings, type the proxy server FQDN under Use this URL to connect to my proxy server for Exchange, click OK to have a try, and then click
OK to save all settings.
4. Restart Outlook.
Regards,
Winnie Liang
TechNet Community Support

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