We are unable to connect to our environment after restarting tomcat . We have not done any changes in application level or OS level that we know of . 

But we see the below in Cataline log and OSP logs . 

Connectivity is from IDM ->(Firewall) -> access gateway

OSP :

Error in OSP : Preamble: [OSP]
Priority Level: WARNING
Java: internal.atlaslite.jcce.syslog.sender.SyslogStatusRecorder.logReport() [72] thread=osp-common-thread-10
Time: 2024-06-21T00:00:57.713+0200
Log Data: Unable to reach configured syslog host.
(Repeated 29 times in last interval of 1m 0.353s)

java.net.NoRouteToHostException: No route to host (Host unreachable)
java.net.PlainSocketImpl: PlainSocketImpl.java: socketConnect: -2
java.net.AbstractPlainSocketImpl: AbstractPlainSocketImpl.java: doConnect: 350
java.net.AbstractPlainSocketImpl: AbstractPlainSocketImpl.java: connectToAddress: 206
java.net.AbstractPlainSocketImpl: AbstractPlainSocketImpl.java: connect: 188
java.net.SocksSocketImpl: SocksSocketImpl.java: connect: 392
java.net.Socket: Socket.java: connect: 607
java.net.Socket: Socket.java: connect: 556

Error in Catalina :         at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-util.jar:9.0.55]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_312]
11:01:01.493 [https-jsse-nio-8443-exec-14] WARN  com.microfocus.workflow.idm.auth.oauth.OAuthTokenManager - [RBPM] Failed to fetch the token from OAuth Server. HTTP status code: 404 Detail message from authentication server:
11:01:01.493 [https-jsse-nio-8443-exec-14] ERROR com.netiq.idm.workflow.client.WorkflowUtil - [RBPM] Invalid Credentials
com.netiq.idm.auth.oauth.InvalidCredentialsException:
        at com.microfocus.workflow.idm.auth.oauth.OAuthTokenManager.handleRequestError(OAuthTokenManager.java:376) ~[IDMWorkflowAuth.jar:?]
        at com.microfocus.workflow.idm.auth.oauth.OAuthTokenManager.fetchToke