I debug the script. Then I'd like to pause debuging and that i see:


DBG

Failed to start debug session

reason:
failed to establish connection to client host on 127.0.0.1:7869



I use php 4.3.2 and dbg 2.11.22
In 2.11.5 all was OK. How can i pause the debug session?

first of all, likely "Pause" is not what you want to do. Suppose you somehow got an endless loop and what to interrupt execution and see where the script is executing. That's how "Pause" works.
Please note, "Pause" is available only after you started a debug session.

I think you likely want to start debug session and be able to execute a script step by step or get it breaked on one of breakpoints etc.
At least, according to error message I see that you was unable to start debug session.

In order to debug scripts you have to install IDE, then run it, then open a script and debug it. If you want to debug scripts running under Apache (either remote or local) your have to install debugger module (php_dbg.dll-4.3.2 or dbg.so-4.3.2 depending on the platform you run),
create a project in phped (file->new project), tune properties such as "root URL" and "remote root directory". Then you'll be able to start debug sessions.