# 😱 Read Replia Won't Start 😱

**URL:** <https://community.neo4j.com/t/read-replia-wont-start/59436>\
**Category:** Neo4j Graph Platform\
**Tags:** migrated\
**Created:** [September 7, 2022, 12:45am UTC](https://community.neo4j.com/t/read-replia-wont-start/59436 "2022-09-07T00:45:27Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![jasperblues](https://sea1.discourse-cdn.com/flex021/user_avatar/community.neo4j.com/jasperblues/32/2845_2.png) [@jasperblues](https://community.neo4j.com/u/jasperblues)\
**Post date:** [September 7, 2022, 12:45am UTC](https://community.neo4j.com/t/read-replia-wont-start/59436/1 "2022-09-07T00:45:27Z")

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Hey folks. Have set up a causal cluster on GCloud using Terraform. We have a single read replica that runs backups.

On dev: Read replica starts normally.

On prod, it never gets to fully started state.

`````` **Logs:**

Sep 06 23:25:42 neo4j-prod-read-backup neo4j[12437]: 2022-09-06 23:25:42.562+0000 WARN The 'dbms.security.procedures.unrestricted' setting is overridden. Setting value changed from 'apoc.\*' to 'apoc.\*'.  
Sep 06 23:25:42 neo4j-prod-read-backup neo4j[12437]: 2022-09-06 23:25:42.569+0000 WARN The 'dbms.security.procedures.allowlist' setting is overridden. Setting value changed from 'apoc.\*' to 'apoc.\*'.  
Sep 06 23:25:42 neo4j-prod-read-backup neo4j[12437]: 2022-09-06 23:25:42.570+0000 INFO Note that since you did not explicitly set the port in causal\_clustering.discovery\_advertised\_address Neo4j automatically set it to 5000 to match causal\_clustering.discovery\_listen\_address. This behavior may change in the future and we recommend you to explicitly set it.  
Sep 06 23:25:42 neo4j-prod-read-backup neo4j[12437]: 2022-09-06 23:25:42.575+0000 INFO Starting...  
Sep 06 23:25:44 neo4j-prod-read-backup neo4j[12437]: 2022-09-06 23:25:44.241+0000 INFO This instance is ServerId{3f3a91ea} (3f3a91ea-a379-4684-9321-8ed4abbb6baf)  
Sep 06 23:25:48 neo4j-prod-read-backup neo4j[12437]: 2022-09-06 23:25:48.690+0000 INFO ======== Neo4j 4.4.9 ========  
^-- hangs here

The only difference that I can see between the two envs are IP addresses that get written to Neo4j.conf via terraform. I checked ports are open via nmap.

What can I do to debug further?

I'm a long-time Neo4j user, but not too much experience with Causal Clustering.

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<div class="post-metadata">

**Author:** ![jasperblues](https://sea1.discourse-cdn.com/flex021/user_avatar/community.neo4j.com/jasperblues/32/2845_2.png) [@jasperblues](https://community.neo4j.com/u/jasperblues)\
**Post date:** [September 8, 2022, 2:07am UTC](https://community.neo4j.com/t/read-replia-wont-start/59436/2 "2022-09-08T02:07:23Z")

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For the akka discovery message that fails, I can both ping this host and nmap it on port 5000

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<div class="post-metadata">

**Author:** ![jasperblues](https://sea1.discourse-cdn.com/flex021/user_avatar/community.neo4j.com/jasperblues/32/2845_2.png) [@jasperblues](https://community.neo4j.com/u/jasperblues)\
**Post date:** [September 8, 2022, 12:50am UTC](https://community.neo4j.com/t/read-replia-wont-start/59436/3 "2022-09-08T00:50:54Z")

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2022-09-08 00:47:51.641+0000 ERROR [a.e.DummyClassForStringSources] Outbound message stream to [akka://cc-discovery-actor-system@10.142.15.230:5000] failed. Restarting it. The connection has been aborted  
akka.stream.StreamTcpException: The connection has been aborted  
2022-09-08 00:47:51.661+0000 WARN [a.c.c.ClusterClient] Receptionist reconnect not successful within Some(10 seconds) stopping cluster client

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<div class="post-metadata">

**Author:** ![jasperblues](https://sea1.discourse-cdn.com/flex021/user_avatar/community.neo4j.com/jasperblues/32/2845_2.png) [@jasperblues](https://community.neo4j.com/u/jasperblues)\
**Post date:** [September 14, 2022, 3:48am UTC](https://community.neo4j.com/t/read-replia-wont-start/59436/4 "2022-09-14T03:48:22Z")

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Got this solved. Turned out to be firewall rules.

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<div class="post-metadata">

**Author:** ![dishant.shah](https://avatars.discourse-cdn.com/v4/letter/d/898d66/32.png) [@dishant.shah](https://community.neo4j.com/u/dishant.shah)\
**Post date:** [May 4, 2024, 3:38pm UTC](https://community.neo4j.com/t/read-replia-wont-start/59436/5 "2024-05-04T15:38:06Z")

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Hey, did you use?  
firewall-cmd --zone=public --add-port=5000/tcp --permanent  
firewall-cmd --reload