I would start with some basic network test such as:
On your asterisk box start with the following:
netstat -andp | grep asterisk
Amongst other lines you should see the following. This shows that asterisk is ready to accept connections on port 8088. If this doesn't show up then your http.conf is wrong.
tcp 0 0 0.0.0.0:8088 0.0.0.0:* LISTEN 4553/asterisk
The are key settings in both manager.conf and http.conf. In manager.conf you must have at a minimum:
[general]
enabled=yes
webenabled=yes
[click]
secret = apassword
deny=0.0.0.0/0.0.0.0
permit=X.0.0.0/255.0.0.0
read = system,call,log,verbose,command,agent,user
Where X is the first number that appears in your clients IP address.
For instance my laptops address is 10.1.0.34 so my permit statement is:
permit=10.0.0.0/255.0.0.0
Note: this is not very secure as it will allow any other computer that has an IP address beggining with '10' to have access to asterisk.
Your http.conf file looks correct.
Once you have the above working then from the client PC try
ping asteriskboxip
If that succeeds then try:
telnet asteriskboxip 8088
If that succeeds then hit the enter key twice and you should see something very similar to the following. If its not the same then you probably have something other than asterisk running on the port.
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
HTTP/1.1 200 OK
Server: Asterisk/1.4.22.1
Date: Fri, 27 Feb 2009 11:12:09 GMT
Connection: close
Cache-Control: no-cache, no-store
Content-type: text/html
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>400 Bad Request</title>
</head><body>
<h1>Bad Request</h1>
<p>Invalid Request</p>
<hr />
<address>Asterisk Server</address>
</body></html>
Connection closed by foreign host.
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