Can not access FNB website at all in my office computer on WI-FI

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I the past weeks I was trying to access FNB website at our office and I could not. I cleared cache, deleted browser history still nothing.

Eventually I called Telkom on 10210

This was their helping instructions.

Step 1

On address enter 10.0.0.1 or 2

Step 2

Login screen appeared.
Username : admin (or whatever you chose)
pass : admin

Step 3

Main menu click on Advance . On Side Menu Click on DNS

Change to first option below. Clear cache, delete history and I was back in business.

		Obtain DNS info from a WAN interface:
		WAN Interface selected:
		Use the following DNS server addresses

Preferred DNS server :
Alternate DNS server :