Neo4jClient returns 403 FORBIDDEN: Request forbidden by administrative rules

When trying to add a relationship between two nodes in a neo4j instance using Neo4jClient, I get the following error: Request forbidden by administrative rules.

`public async Task CreateFollowship(Guid followerId, Guid followedId) { await _neo4jClient.ConnectAsync();

    await _neo4jClient.Cypher
        .Match("(follower:User)", "(followed:User)")
        .Where($"(User follower) => follower.Id == {followerId}")
        .AndWhere($"(User followed) => followed.Id == {followedId}")
        .Create("follower-[:FOLLOWS]->followed")
        .ExecuteWithoutResultsAsync();

}`

The query generated is (by example):

MATCH (follower:User), (followed:User) WHERE (User follower) => follower.Id == "970486dc-5430-4532-8ed3-e30efa930105" AND (User followed) => followed.Id == "f6a15b31-e328-4113-8541-3de8108b116d" CREATE follower-[:FOLLOWS]->followed

I tried in other ways:

MATCH (follower:User), (followed:User) WHERE follower.Id == "970486dc-5430-4532-8ed3-e30efa930105" AND followed.Id == "f6a15b31-e328-4113-8541-3de8108b116d" CREATE follower-[:FOLLOWS]->followed

MATCH (follower:User), (followed:User) WHERE follower.Id IS "970486dc-5430-4532-8ed3-e30efa930105" AND followed.Id IS "f6a15b31-e328-4113-8541-3de8108b116d" CREATE follower-[:FOLLOWS]->followed

When running the command on the Neo4j Console using Cypher, i get different syntax errors with every attempt to fix. What is the correct syntax? An incorrect syntax is really the reason for the 403 error?

[Clooney24]

HI @guilhermedjr, correct Cypher syntax is

MATCH (follower:User), (followed:User) 
WHERE follower.Id = "970486dc-5430-4532-8ed3-e30efa930105" AND followed.Id = "f6a15b31-e328-4113-8541-3de8108b116d" 
CREATE (follower)-[:FOLLOWS]->(followed)

Unless it is intended, I would recommend using MERGE instead of CREATE to prevent creating multiple similar relationsships between the nodes.

Using Neo4jClient in C# this would be (with Create replaced by Merge):

 await _neo4jClient.Cypher
        .Match("(follower:User), (followed:User)")
        .Where((User follower) => follower.Id == followerId)
        .AndWhere((User followed) => followed.Id == followedId)
        .Merge("(follower)-[:FOLLOWS]->(followed)")
        .ExecuteWithoutResultsAsync();

or alternatively by using string and parameters

 await _neo4jClient.Cypher
        .Match("(follower:User) (followed:User)")
        .Where("follower.Id = $followerId")
        .WithParam("followerId", followerId) 
        .AndWhere("followed.Id = $followedId")
        .WithParam("followedId", followedId) 
        .Merge("(follower)-[:FOLLOWS]->(followed)")
        .ExecuteWithoutResultsAsync();

Params could also be set using just one “.WithParams” instead of the two “.WithParam”, but I like using it one by one.

Where-Clauses also could be set using string interpolation ($“follower.Id = {followerId}”) but this is not recommended as it prevents query caching.

Be aware that Cypher doesn’t accept “==” (or “!=”) as operators, these only work in C#. Has to be “=” or “<>” in Cypher.

Response status 403 means “Bad Request” so it’s due to that incorrect syntax and not a bug in Neo4jClient.

Best, Reiner

[cskardon]

I don’t see why you would have a problem with Aura and not allowing write operations from an external source - if you can connect to the server - then it should work fine.

What is your entire connection setup - i.e. how are you creating the IGraphClient?