Try nslookup <server_name> and find out the correct IP address of the server.
If the IP Address is changed on the server, you may need to decommission the existing one and enroll again with the new server.
the server is not in the bbsa,and i am sure i had decommission the server from bbsa,but when i add the server to bbsa again from the bbsa console,the error"faild to connect to **** 4750" happen still exits.
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nslookup won't help if the name to ip mapping is in the hosts file..
the ip that's showing in the log snippet, is that correct ? it looks like no. java maintains it's own dns cache so if the server was previously resolved by the appserver that result will be cached until the appserver service is restarted. it look like this is the case because the ip you showed in the agent info differs from what's in the log snippet. so you should probably do a couple things. there are a couple ttl settings in the NSH/br/java/lib/security/java.security file for dns ttl. you need to change those so that good lookup results are not cached forever. google for 'java dns ttl' and one of the first couple articles should explain it. 2 restart the appserver service.