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I map drives and put the check box to include restore connection which is same as persistent. I use the windows gui to map a networked drive. It works fine unless the server is bad somehow.
I have no idea about that dns but it doesn't apply here. nslookup command ought to reveal the name server. dns resolved FQDN's to IP addresses. Since you are using static then use the IP address. Windows client name resolution would be a different deal. You put the dns entry either or both of your companies dns server or your isp's server. I wouldn't suggest you allow internet access on any lan that has a business computer so you shouldn't need a dns number at all.
You have a security issue also seems to me. Why connect anything as a admin. Use a user account.
I map drives and put the check box to include restore connection which is same as persistent.
1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.