SharePoint 2010/F5 authentication issue

Hi,

 

According to the network engineer, he had set up SharePoint 2010 using template within F5 and all is looking okay except one small issue where username/password prompt keeps asking for authentication. When ignored and URL is re-entered, the site works fine. It's not a permission related issue within SharePoint because this works if traffic is pointing directly to the web servers. NTLM is being used and from what I'm told this is also enabled on F5. We're also offloading SSL. This issue doesn't occur on other broswers but only occurs with IE. Checked all the related settings in IE for SharePoint and they all look good.

 

Any ideas would be much appreciated.

 

Thank you.