Task stopped with No supported plugins found on source error

Question

Hi,  
we are facing an issue with DMS. We are trying to migrate a Postgresql RDS 9.5.15  database to a Postgresql RDS 10.6 Database on two AWS different accounts.  
  
 I've created 5 tasks for 5 sets of tables, the initial loading ran successfully but 2 of the 5 tasks have stopped with the "No supported plugins found on source".  
  
Source Endpoint ARN :

```
arn:aws:dms:eu-central-1:815819815090:endpoint:DJMVJEYU75P7WQQQYSTSN5HCJQ
```

Target Endpoint ARN :

```
arn:aws:dms:eu-central-1:815819815090:endpoint:P7J6J4W5GXOAIMDIV42OAQ27OE
```

The two failed tasks ARN are
 `arn:aws:dms:eu-central-1:815819815090:task:627LGUDZC5SY72TYPSQCZHAYHM`
 and

```
arn:aws:dms:eu-central-1:815819815090:task:BVK3KOPYZ7CO5QW7SBRSJNEHNY
```

Before created the task, I set
 `rds.logical_replication`
 on the source RDS server and reboot it successfully.  
  
On the source server, I can see 5 replication slots in the
 `pg_replication_slots`
 Postgres view, but only 3 on 5 are active.  
  
I can't understand the problem, and I would be very grateful if someone can help me.  
  
Thanks in advance  
  
François

Answer

So I will answer myself.   
  
I had 5 DMS tasks with 5 logical replication slots in PG (one for each task, according to the Cloudwatch logs). But DMS said that "all slots are in use" which was wrong.  
  
As 2 of my tasks didn't need to be set as CDC, I deleted these and keep three tasks. Then I deleted the two unnecessary logical slots in PG (with a select pg_drop_replication_slot(XXX)). Finally, I was able to resume my two failed tasks and they are running now.  
  
So my guess is that unlike the doc said (), you don't need 5 replication slots for 5 tasks but more. I think I perhaps could have changed the max_replication_slots of the source server, but as I can't reboot it again, it couldn't be a solution.

Task stopped with No supported plugins found on source error

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