Error 12288: An error when connecting to store connect

AX for Retail’s installation documentation mentions that the store connect service should run under a dedicated domain account. Remember this when setting up the store-side Retail store connect.
Also other steps to troubleshoot this errors would include:
1. Making sure the store connect service is running at the store side
2. Make sure HQ-side computer can resolve the name of the store-side SC server name into an IP address.
3. Make sure that you’ve set up corresponding port numbers
4. Make sure that these ports/store connect program are not blocked by the firewall
5. Verify that you use/or not “use encryption” at both sides (in HQ and in Store’s Retail store connect)
6. Also make sure that you have set up IPsecure in case you use encryption.

AX for Retail R2 – How to run POS in offline mode?

If the POS system disconnected from the back end AX system (e.g: network disrupt, router hardware issues, etc) then it may display following error when you try to login to your POS system:

This error is not refer to multiple logon issue. I guess the POS system try to validate the staff profile with store number, and verify against “AllowMultipleLogins” value which only exists in AX back end DB. It will failed due to AOS/RTS are not reachable.
Solution:
Marked the “Continue on TS errors” at HQ > Setup > Staff > General tab