I was trying to troubleshoot why one of our PCs was having problems connecting to our Exchange server. I checked and they had access to the network and to the internet and everything except Outlook seemed to be working fine.
I did a nslookup on mail.myco.com and it returned the local IP address of the mail server. I then did a ping and it resolved to an external IP address. I then checked the DNS servers and they were the same as everyone elses (configured with DHCP).
I then went to a different PC and tried the same thing. On this PC nslookup and ping both resolved to the same address. This network settings on this PC were setup manually and one of the DNS servers was different so I changed them to match the original PC and tried again with the same results. On the PC I am having the problem with nslookup resolves to the IP I am looking for but pIng and Outlook do not. On a different PC nslookup, ping and Outlook all work fine and resolve to the correct internal IP address.
What would make one PC resolve the address differently between nslookup and ping?