I cannot send files or DCC chats. How do I fix this?

Usman

To correct DCC SEND problems in mIRC, try the following:

1. In the File menu, select Options.
2. Under the Connect item, select Local Info
3. Clear the text in the boxes marked Local Host and IP Address
4. Check the box Local Host under On connect, always get
5. Check the box marked Server under Lookup method
6. Disconnect, then connect to IRC again

If you use Windows XP, try to disable your XP firewall (or any other firewalls that you might have installed on your PC) for the moment, send, and then reactivate the firewall.
To disable your Windows XP firewall, do the following:

7. Right click My Network Places
8. Select Properties
9. Right click the connection you're using
10. Select Properties
11. Select Advanced tab
12. UN-check Internet Connection Firewall

If you use a router, open a range of ports in your router, for example 5000-5009, then change the default mIRC DCC port in View / Connect / Options / Advanced to the same numbers. You should consult the documentation for your router for more information on this.