1. Try to rediff your client (remove "read data folder first" or double check your data folder if there's clientinfo.xml)
2. Try to re-open again the port
iptables -I INPUT 1 -p tcp --dport 6900 -j ACCEPT
iptables -I INPUT 1 -p tcp --dport 5121 -j ACCEPT
iptables -I INPUT 1 -p tcp --dport 6121 -j ACCEPT
3. Give me your IP I'll try to connect.
Open your import/item_trade.txt.
// Item Trade Restrictions Database
// Defines special trade rules for individual items.
//
// Structure of Database:
// Item ID, TradeMask,Group Level Override
//
// Legend for 'TradeMask' field (bitmask):
// 1 - item can't be dropped
// 2 - item can't be traded (nor vended)
// 4 - wedded partner can override restriction 2
// 8 - item can't be sold to npcs
// 16 - item can't be placed in the cart
// 32 - item can't be placed in the storage
// 64 - item can't be placed in the guild storage
// 128 - item can't be attached to mail
// 256 - item can't be auctioned
//
// Example:
// 1161,67,50
// Balmung cannot be dropped, traded, or placed in Guild Storage (1+2+64).
// Only groups of group-level 50 and up can override this setting.