Solutions xterm closes with: network caused connection abort
Your xterm or other X client started through a X-Win32 session closes with the error network caused connection abort. This only occurs with SSH because SSH is typically the only connection method used across firewalls and network address translation (NAT) devices or software, since X11 Forwarding makes this much easier to do with SSH than with rsh, rexec, or Xdmcp.
Firewalls and network address translation devices (e.g. Linksys, D-Link, and Netgear cable or dsl routers) typically have a table of active connections that they are handling and they use a timer to determine when to remove an inactive connection from the table. When the connection is removed from the table the device can no longer send data in either direction for that previously existing connection. The simplest way to work around this problem is to run a client that periodically sends data, such as xclock (which sends new positions for the hour and minute hands on the clock once a minute); this continuously resets the connection timer and keeps the connection alive.
Additionally, X-Win32 8 sends SSH2 keep alive packets in SSH every five minutes by default so that your connections across firewalls and NAT devices will not timeout. Thus, you may want to consider upgrading to X-Win32 8.