[Serusers] serweb CTD and message

Hello again, I've sent this message already, but no reply yet. Anyway, Im still facing the problem with CTD and IM in serweb. All the time it would say "503 Service Unavailable". /var/log/messages shows May 15 14:43:14 sip /usr/local/sbin/ser[79174]: ERROR: udp_send: sendto(sock,0x284c0800,452,0,0x284bf208,16): Host is down(64) May 15 14:43:14 sip /usr/local/sbin/ser[79174]: msg_send: ERROR: udp_send failed May 15 14:43:14 sip /usr/local/sbin/ser[79174]: Warning: run_failure_handlers: no UAC support (0, 256) What host is down?? /var/log/serweb shows May 12 22:02:26 serweb [debug] Html form was not assigned to APU apu_aliases3. Useing default. May 12 22:02:26 serweb [debug] Html form was not assigned to APU apu_acl4. Useing default. May 12 22:02:30 serweb [debug] Html form was not assigned to APU apu_aliases3. Useing default. May 12 22:02:30 serweb [debug] Html form was not assigned to APU apu_acl4. Useing default. May 12 22:04:00 serweb [debug] Html form was not assigned to APU apu_aliases3. Useing default. May 12 22:04:00 serweb [debug] Html form was not assigned to APU apu_acl4. Useing default. Is that a problem? Please, can anyone tell me what happened?? Regards, Andrey.