Three things to make sure of.
1st. Make sure that your itemserver.txt file in the zones is named correctly. Some use item-server.txt and others itemserver.txt.
2nd. Don't attempt to open the mall in Mandara. I have never been able to do that in my server so I suggest you try to check with other zones first. Also the 01 in the serverlist in the server makes absolutely no difference so get rid of it. The top numbers are only for the HTMessage.txl file and the server doesn't use this file.
3. Make sure that port 7514 is opened in your server. If this port is not accessible then you cannot use the item mall.