Error contacting apcupsd @ localhost:3551: Connection refused

Good day! Faced with a trouble while trying to setup apcupsd on vMA. Here is config: /etc/apcupsd/apcupsd.conf:

UPSCABLE ether

UPSTYPE snmp

DEVICE 10.99.64.254:apc:public #(this is IP-address of my Smart UPS)

NETSERVER on

NISPORT 3551 (#and this is a port by default)

But when I'm trying to connect to UPC I receive this error:

Error contacting apcupsd @ localhost:3551: Connection refused

So this is looks like problem is in iptables. But there is no any restriction in iptables of this machine (SUSE 11 based):

sudo iptables -t filter -nvL

Chain INPUT (policy ACCEPT 113 packets, 11906 bytes)

pkts bytes target     prot opt in     out     source               destination

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)

pkts bytes target     prot opt in     out     source               destination

Chain OUTPUT (policy ACCEPT 22 packets, 4468 bytes)

pkts bytes target     prot opt in     out     source               destination

Can you give me advice what should I check? Thank you.