George4Tacks
Level 15
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From IRS Pub 1345 I believe it has something to do with IP address of the computer 

Internet Protocol Information
Internet Protocol (IP) information of the computer the ERO uses to prepare the return (or originate the
electronic submission of collected returns) must be included in all individual income tax returns. The
required Internet Protocol information includes:
• Public/routable IP address
• IP date
• IP time
• IP time zone
With many different ERO e-filing business models, the computer used to prepare (or originate the
electronic submission of collected returns) may not have a public/routable IP address. If the computer used for preparation (or origination of the electronic submission of collected returns) is on an internal reserved IP network, then the IP address should be the public/routable IP address of the computer used to submit the return. If the computer used for preparation (or origination of the electronic submission of collected returns) is used to transmit the return to the IRS, then the IP address should be the public/routable IP address of that computer. If it is not possible to capture the public/routable IP address, then the ERO or software may have to hard code the IP address into each return.
The IRS will reject individual income tax returns e-filed without the required IP address. Any return received by the IRS containing a private/non-routable IP address will be flagged in the acknowledgment File with an “R” in the Reserved IP Address Code field of the ACK key record indicating that a reserved IP address is present for the return.


ex-AllStar