External MySQL NAT Problems

[GBV]

Hi all,   I using Debian 3.0r1 2.4.19   When I try to access an external mysql host on internet by a windows MASQUERADE client using either MySQL-Front or Access ODBC, the connection is lost many times making windows crash.   I´m using Iptables with NAT to all internal hosts.   IC = internal client I = internet F = firewall and NAT ES = External mysql server   IC <-> F <-> I <-> ES   Someone has experience on this problem?   Is there any iptables manipulation that can correct this abnormality?   Thanks..   Guilherme Viebig