CouchDB replications not starting when new replication added -

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when add replication couchdb, doesn't start. i.e. following doc after saving:

{    "_id": "xxx",    "_rev": "yyy",    "target": "https://user:pswd.domain/db",    "source": "db",    "create_target": true,    "continuous": true,    "user_ctx": {        "name": "admin",        "roles": [            "_admin"        ]    },    "owner": "admin" }

usually after creating replication, replication triggered , doc updated include:

   "_replication_state": "triggered" or "error",    "_replication_state_time": "some time",    "_replication_id": "some id"

i using couchdb 1.6.0 on ubuntu 16.04. cause happen? replication working fine until hour ago when 80 of 140 or replications failed @ once.

there 60 replications seen 'triggered' in couch. _active_tasks endpoint shows 46.

as turned out our server experiencing high traffic super dodgy origins. causing replications timeout, , not allowing replications restart. nginx access logs seemed show repeated attempts @ fishing insecure php settings , open mysql databases


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