有多个应用服务器某些应用服务器报错   报错了的服务器试了 telnet ip  1521 能通 

alter 日志连接报错应用服务器对应的报错信息如下

2019-07-03T11:29:55.963231+08:00

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Fatal NI connect error 12170.

  VERSION INFORMATION:
 TNS for Linux: Version 12.2.0.1.0 - Production
 Oracle Bequeath NT Protocol Adapter for Linux: Version 12.2.0.1.0 - Production
 TCP/IP NT Protocol Adapter for Linux: Version 12.2.0.1.0 - Production
  Time: 03-JUL-2019 11:29:55
  Tracing not turned on.
  Tns error struct:
    ns main err code: 12535
   
TNS-12535: TNS:operation timed out
    ns secondary err code: 12606
    nt main err code: 0
    nt secondary err code: 0
    nt OS err code: 0
  Client address: (ADDRESS=(PROTOCOL=tcp)(HOST=10.188.68.40)(PORT=56293))
2019-07-03T11:29:55.967106+08:00
HCCBMPDB(3):WARNING: inbound connection timed out (ORA-3136)