Unable to connect to Site Recovery Manager Server - java.net.UnknownHostException: Temporary failure in name resolution
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Unable to connect to Site Recovery Manager Server - java.net.UnknownHostException: Temporary failure in name resolution

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Article ID: 312741

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Updated On:

Products

VMware Live Recovery

Issue/Introduction

Symptoms:


SRM UI display the below errors - 

ERROR
Unable to retrieve pairs from extension server at https://DRSRM:443/drserver/vcdr/vmomi/sdk. Unable to connect to Site Recovery Manager Server at https://DRSRM:443/drserver/vcdr/vmomi/sdk. Reason: java.net.UnknownHostException: DRSRM: Temporary failure in name resolution
Unable to connect to Site Recovery Manager Server at https://DRSRM:443/drserver/vcdr/vmomi/sdk. Reason: java.net.UnknownHostException: DRSRM: Temporary failure in name resolution
Operation ID: d3b05c76-6c97-48e2-b102-a398cf801775
8/3/20, 1:26:11 PM -0400


Unable to retrieve pairs from extension server at https://HQSRM:443/drserver/vcdr/vmomi/sdk.Unable to connect to Site Recovery Manager Server at https://HQSRM:443/drserver/vcdr/vmomi/sdk. Reason: java.net.UnknownHostException: HQSRM: Temporary failure in name resolution
SRM Server at HQ-SRM-01 is unreachable.
Unable to connect to Site Recovery Manager Server at https://HQSRM:443/drserver/vcdr/vmomi/sdk. Reason: java.net.UnknownHostException: HQSRM: Temporary failure in name resolution
Operation ID: 0acf80a1-a0a1-43b4-a9c2-8e58fab0245b
8/3/20, 1:26:17 PM -0400


SRM Server at DRSRM is unreachable.

1. SRM appliances successfully register to vCenter
2. You notice the same errors whether you register SRM using its FQDN or IP address
3. You are able to PING the SRM appliances using its IP address/FQDN (DNS records are fully resolvable)
4. No PSC SSL thumbprint mismatch OR duplicate cs.identity.sso entries are found
5. There are no internal or external firewalls blocking any ports and also you are able to connect to port # 443 by running the curl command 
    
dr-client.log:

2020-08-03 16:13:03,184 [srm-reactive-thread-15] WARN  com.vmware.srm.client.infrastructure.requestHandlers.navigation.SitePairHelper -5521004966068210375 593d3eb4-5c51-4157-b69a-6786fd8b3905 getDrSitePairs - Fail to get SRM sitePairData for SrmServerImpl {_guid = 7e366da4-4b7a-4365-ace0-e91317e0f197_url = https://DRSRM:443/drserver/vcdr/vmomi/sdk
}:
com.vmware.srm.client.topology.client.view.availability.ExtensionServer$GetPairFailedException: Unable to retrieve pairs from extension server at https://DRSRM:443/drserver/vcdr/vmomi/sdk.Unable to connect to Site Recovery Manager Server at https://DRSRM:443/drserver/vcdr/vmomi/sdk. Reason: java.net.UnknownHostException: DRSRM: Temporary failure in name resolution
        at com.vmware.srm.client.topology.impl.view.availability.ExtensionServerImpl.complete(ExtensionServerImpl.java:51)
        at com.vmware.srm.client.reactive.impl.PromiseImpl$ErrorCompletion.complete(PromiseImpl.java:178)
        at com.vmware.srm.client.reactive.impl.PromiseImpl$Result.complete(PromiseImpl.java:41)
        at com.vmware.srm.client.reactive.impl.PromiseImpl$Completion.lambda$null$8(PromiseImpl.java:71)
        at com.vmware.srm.client.utilities.ThreadContext.lambda$wrap$12(ThreadContext.java:38)
        at com.vmware.srm.client.utilities.ThreadContext.execute(ThreadContext.java:183)
        at com.vmware.srm.client.utilities.ThreadContext.execute(ThreadContext.java:193)
        at com.vmware.srm.client.utilities.ThreadContext.execute(ThreadContext.java:176)
        at com.vmware.srm.client.utilities.ThreadContext.setupContext(ThreadContext.java:59)
        at com.vmware.srm.client.utilities.ThreadContext.setupContext(ThreadContext.java:87)
        at com.vmware.srm.client.reactive.impl.PromiseImpl$Completion.lambda$setResult$9(PromiseImpl.java:71)
        at com.vmware.srm.client.utilities.AsyncConsumer$Worker.run(AsyncConsumer.java:37)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
Caused by: com.vmware.vim.vmomi.client.exception.ConnectionException: Unable to connect to Site Recovery Manager Server at https://DRSRM:443/drserver/vcdr/vmomi/sdk. Reason: java.net.UnknownHostException: DRSRM: Temporary failure in name resolution
        at com.vmware.srm.client.topology.impl.vmomi.vlsi.VmomiServiceImpl.lambda$getVersionInternal$53(VmomiServiceImpl.java:400)
        at com.vmware.srm.client.reactive.impl.PromiseImpl$ComposeCompletion.complete(PromiseImpl.java:207)
        at com.vmware.srm.client.reactive.impl.PromiseImpl$Result.complete(PromiseImpl.java:39)
        ... 17 more
Caused by: java.net.UnknownHostException: DRSRM: Temporary failure in name resolution
        at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
        at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:929)
        at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1324)
        at java.net.InetAddress.getAllByName0(InetAddress.java:1277)
        at java.net.InetAddress.getAllByName(InetAddress.java:1193)
        at java.net.InetAddress.getAllByName(InetAddress.java:1127)

        at org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45)
        at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager$InternalAddressResolver.resolveRemoteAddress(PoolingNHttpClientConnectionManager.java:637)
        at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager$InternalAddressResolver.resolveRemoteAddress(PoolingNHttpClientConnectionManager.java:608)


Environment

VMware Site Recovery Manager 8.3.x

Cause


It seems the SRM appliance has difficulty in resolving the FQDN names internally.

Resolution

  1. Login to VCSA & SRM appliances using SSH
  2. Edit and update the ‘hosts’ file to include vCenter and SRM  IP & FQDN information of both the sites
  3. Format is "IP FQDN Hostname"; Example: "192.168.100.21 SRM01.domain.local SRM01"
  4. Refresh the SRM browser tab

Editing files on an ESXi host using vi (1020302) - https://kb.vmware.com/s/article/1020302