asp.net - not able to resolve java.net.UnknownHostException -

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am trying connect server using telnetwrapper apache.commons.net jar before days working file giving java.net.unknownhostexception

am not able figure out why can please give me possible reason behind because working fine before started giving exceptions

thanks in advance

complete exception 

wrapper: java.net.unknownhostexception: cmsrv3 java.lang.exception: error connecting telnet server.     @ com.honeywell.corept.util.telnetclient.<init>(telnetclient.java:25)     @ com.honeywell.corept.cm21.telnetclient.<init>(telnetclient.java:18)     @ cm21.build.cm21build.main(build.java:576)


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