Thanks for the suggestions.

After entering firewall rules for ports 3483 and 9000 and enabling ufw,
command

Code:
--------------------
    sudo ufw status verbose
--------------------

shows the following:

Code:
--------------------
    Status: active
  Logging: on (low)
  Default: deny (incoming), allow (outgoing), disabled (routed)
  New profiles: skip
  
  To                         Action      From
  --                         ------      ----
  3483/udp                   ALLOW IN    Anywhere                  
  3483/tcp                   ALLOW IN    Anywhere                  
  9000/tcp                   ALLOW IN    Anywhere                  
  3483/udp (v6)              ALLOW IN    Anywhere (v6)             
  3483/tcp (v6)              ALLOW IN    Anywhere (v6)             
  9000/tcp (v6)              ALLOW IN    Anywhere (v6)
--------------------

Outgoing traffic is allowed by default, and the firewall rules are
supposed to allow incoming traffic on ports 3483 (udp and tcp) and 9000
(tcp).

However Squeezeplay still can't connect to the LMS server. After
starting Squeezeplay, the firewall log file /var/log/ufw.log shows the
following (MAC address disguised for privacy reasons):

Code:
--------------------
    Dec  3 21:56:01 ATHLON5050 kernel: [ 2594.313035] [UFW BLOCK] IN=eth0 OUT= 
MAC=00:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:00 SRC=192.168.0.101 
DST=192.168.0.100 LEN=105 TOS=0x00 PREC=0x00 TTL=64 ID=23868 PROTO=UDP SPT=3483 
DPT=40162 LEN=85
--------------------

192.168.0.101 is the ip address of the Windows 7 machine that runs LMS
192.168.0.100 is the ip address of the Lubuntu machine that runs
Squeezeplay

Note [UFW BLOCK] in the ufw.log file. Even though incoming traffic on
port 3483 is supposed to be allowed by the firewall rule, UFW still
blocks UDP traffic on this port. The result is that Squeezeplay can't
connect to the LMS server. After disabling ufw everything works fine
again.

Suggestions on how to solve this firewall problem are welcome.


------------------------------------------------------------------------
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