network tests stoped working

[Alexander Piavka]

 Hi ,i have exactly the same spamassasin-2.64 installation and
configuration on two hosts with same hardware and exaclty the same
Mandrake 8.2 linux installation. Now a couple of days ago on one hosts
the network tests stoped working, while nothing was changed
and both hosts are open in the firewall.
 Any ideas what could be the reason?
 Thanks a lot