ERROR: failed to open channel

Hello colleagues,

I have TREX,

TREX version info:

  version:             7.10.46.00

  build number:        710.46.354124

  changelist:          354124 (710_REL)

  compile date:        2011-09-12 10:48:41

  compile host:        ldm015

  compile type:        opt

System is stopped all days to 04:16:36 in the logs see,

[Thr 182894175264] Mon Nov 12 04:16:36 2012

[Thr 182894175264] ***LOG Q0I=> NiPConnect2: 172.18.50.120:31001: connect (111: Connection refused) [nixxi.cpp 3147]

[Thr 182894175264] *** ERROR => NiPConnect2: SiPeekPendConn failed for hdl 2/sock 4

    (SI_ECONN_REFUSE/111; I4; ST; 172.18.50.120:31001) [nixxi.cpp    3147]

[182894175264] 2012-11-12 04:16:36.506 e TrexNet      EndPoint.cpp(00243) : ERROR: failed to open channel 172.18.50.120:31001! reason: connection refused

[182894175264] 2012-11-12 04:16:36.506 e TNS          TNSClient.cpp(00663) : sendRequest to novapro41:31001 failed with NetException. data=[getvalue](S)path=/host/novapro41/nameserver/31001/info/sap_retrieval_path|

[182894175264] 2012-11-12 04:16:36.507 e TNS          TNSClient.cpp(00570) : nameserver novapro41:31001 not responding after 10 retries. giving up.

[Thr 182894175264] ***LOG Q0I=> NiPGetHostByName: '' not found: getaddrinfo [niuxi.c 1599]

[182894175264] 2012-11-12 04:16:36.509 e TrexNet      Communication.cpp(01057) : failed to resolve . reason: host unknown

Please help me.

Regards and thanks for support.