vSphere Replication appliance site pair is not listing the remote vCenter server

Products

• VMware vCenter Server

Issue/Introduction

Remote vCenter is unavailable during vSphere Replication pairing.

Error:
Failed to connect to HBR Management Server at https://:8043

dr.log

2025-04-30 17:49:27,889 [srm-reactive-thread-2281] WARN  com.vmware.srm.client.infrastructure.health.lsppconsistency.LsppConsistencyChecker -49175012016048668 8bd8bf29-####-49e8-####-0d379e1ce9c1 checkPscCredentials - Failed to connect to 'HBR Management Server at https://#.#.#.#:8043':com.vmware.vim.vmomi.client.exception.ConnectionException: Unable to connect to HBR Management Server at https://#.#.#.#:8043. 
Reason: java.net.SocketException: Connection reset
        at com.vmware.srm.client.topology.impl.vmomi.vlsi.VmomiServiceImpl.lambda$getVersionInternal$13(VmomiServiceImpl.java:438)
        at com.vmware.dr.ui.tools.reactive.impl.PromiseImpl$ComposeCompletion.complete(PromiseImpl.java:202)
        at com.vmware.dr.ui.tools.reactive.impl.PromiseImpl$Result.complete(PromiseImpl.java:41)

Environment

vSphere Replication 

Cause

TCP Port 8043 was open but having a SSL exception which failed to fetch the certificates from peer vSphere Replication 

>admin@abcd [ ~ ]$ openssl s_client -connect #.#.#.#:8043


CONNECTED(00000003)

write:errno=104

---

no peer certificate available

---

No client certificate CA names sent

---

SSL handshake has read 0 bytes and written 297 bytes

Verification: OK

---

New, (NONE), Cipher is (NONE)

Secure Renegotiation IS NOT supported

Compression: NONE

Expansion: NONE

No ALPN negotiated

Early data was not sent

Verify return code: 0 (ok)

Resolution

In customer Firewall configuration, SSL exception should be allowed on TCP port 8043.

Additional Information

Ports requirement for vSphere Replication as per Link