[Zope] PCGI Error: (102) failure during connect to ZServer

[Artur Mozdzynski]

I have installed 
Zope-2.1.2-5.i386.rpm and
Zope-pcgi-2.1.2-5.i386.rpm
on RedHat Linux

When I try to invoke pcgi script from a web browser
I get this:

Temporarily Unavailable 
    The resource you requested is temporarily unavailable - 
    please try again later. 
C-Runtime errno:
    Connection refused
PCGI Error:
    (102) failure during connect to ZServer
Explanation:
    The PCGI-wrapper program, spawned by Apache to handle the HTTP 
    request via the standard CGI protocol, is unable to connect to 
    the ZServer background process via Unix socket 
    /tmp/pcgitest.socket.

I think it's a common problem, but I couldn't resolve it myself
nor find any troubleshooting for this.
What shall I do?

Artur


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