my iphone 5 keep disable and ask to connect with itunes, but once i connect . the itunes says "itunes cannot connect to the iphone because is locked by a passcode.

You will need to put it into recovery mode.

Follow the steps in this article:

If you forgot the passcode on your iPhone, or your iPhone is disabled - Apple Support

If you have a backup you can restore it from that

Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

Hope this helps!

Follow the instructions i this Apple support article—>If you forgot the passcode on your iPhone, or your iPhone is disabled - Apple Support. If you follow the steps carefully it won’t ask for a passcode.

Based on the information that you provided so far it is impossible to offer you any advice on how to resolve your issue. Please read this—>Writing an effective Apple Support Commun… - Apple Community then try explaining what the problem is and what steps you have done so far to resolve it.

my ******* phone cant connected to your ******* Itunes