topic Re: Max Parallel Sessions Exceeded qlik engine api in Integration, Extension & APIs

Max Parallel Sessions Exceeded qlik engine api

GustavLindstrom — Wed, 16 Jun 2021 08:52:42 GMT

I'm running a python script to extract the script code from Qlik Sense apps through the Engine json API. After a few runs I get error Max Parallel Sessions Exceeded. I create a new web socket for every app (seams to be the only way to open a new app) and the sessions don't seam to end when I close the Web socket. Any help would be appreciated.

def get_scripts(app_ids, header_user):
   count = 0
   app_scripts = []
   for app_id in app_ids:
      ws = websocket.create_connection("wss://localhost/jwt/app/{}".format(app_id), sslopt={"cert_reqs": ssl.CERT_NONE}, header=header_user)
      call_id = 0
      ws.send(json.dumps({
         "method": "OpenDoc",
         "handle": -1,
         "params": [
            "{}".format(app_id)
         ],
         "outKey": -1,
         "id": 2
      }))
      while call_id < 2:
         result = ws.recv()
         y = json.loads(result)
         try:
            call_id = y["id"]
         except:
            print("")

      ws.send(json.dumps({
         "handle": 1,
         "method": "GetScript",
         "params": {},
         "outKey": -1,
         "id": 3
      }))

      while call_id < 3:
         result = ws.recv()
         y = json.loads(result)
         print(y)
         #print(y)
         try:
            call_id = y["id"]
         except:
            print("")
         if call_id == 3:
            result = y['result']
            script = result['qScript']
            print(app_id)
            print(call_id)
            print(script[0:100])
            app_scripts.append([app_id, script])
      count = count + 1
      ws.close()

   return app_scripts

Re: Max Parallel Sessions Exceeded qlik engine api

Damien_V — Wed, 16 Jun 2021 09:22:28 GMT

Hello @GustavLindstrom

For non core-based licenses, there is a session limit of 5 sessions max per 5 minutes.
Even if you close the session, you won't be able to start a new one before 5 minutes.

What you need to do in your script is fetch the session cookie you get back from Qlik Sense on your first request and then reuse this session cookie to reuse the same session for subsequent requests.

Re: Max Parallel Sessions Exceeded qlik engine api

GustavLindstrom — Thu, 17 Jun 2021 07:34:39 GMT

Hi Damien thanks for replying

If I print

print(ws.headers)

I get this

{'set-cookie': 'X-Qlik-Session-jwt=35cd253e-9e76-4cb2-a42e-75f0ed20c160; Path=/; HttpOnly; SameSite=Lax; Secure',

Should I put X-Qlik-Session-jwt 35cd253e-9e76-4cb2-a42e-75f0ed20c160 in the header for the next websocket.create_connection? How should the header for the next connection look like?

Best regards

Gustav

Re: Max Parallel Sessions Exceeded qlik engine api

Damien_V — Fri, 18 Jun 2021 12:47:38 GMT

Hello @GustavLindstrom

Yes, that's what you get as response headers on your first request, then you should pass it in the request headers on the second request, I believe this should be the syntax:

{'Cookie': 'X-Qlik-Session-jwt=35cd253e-9e76-4cb2-a42e-75f0ed20c160;}

Re: Max Parallel Sessions Exceeded qlik engine api

fabdulazeez — Tue, 30 Jan 2024 06:59:19 GMT

Hi Damien,

When establishing a direct connection to the engine using the following configuration:

WebSocket Secure connection to: wss://<Server>:4747/app/<AppId>

Certificates configuration:

certs = ({"ca_certs": ca, "certfile": cer, "keyfile": key, "cert_reqs":ssl.CERT_REQUIRED,"server_side": False})

User specified as sa_api with the following header:

header = {'X-Qlik-User: UserDirectory=internal; UserId=sa_api'}

Is there a limitation on the number of connections that can be opened same time parallely ?

Re: Max Parallel Sessions Exceeded qlik engine api

StefanBackstrand — Tue, 24 Feb 2026 12:31:45 GMT

Hi @Damien_V ! Hope all is good!

We're seeing massive issues in running into the MaxParallelSessionsExceeded error on our QSE Nov 2024, when working against the Engine API and multiple apps.

We're re-using session cookie caching, but still run into this global limitation. Is this configurable in any way? It's basically not possible to build server-wide integrations with this limitation in place, especially not since the limitation seems to be hard coded.

We are querying several apps as part of operations, and there is basically no way of doing this without hitting the limit, if we want to retain user permissions/authorization.

Thanks in advance!

Re: Max Parallel Sessions Exceeded qlik engine api

Damien_V — Mon, 02 Mar 2026 04:05:18 GMT

Hi @StefanBackstrand
I haven't tested that with multiple apps, but I think you're probably right that the method may not work when connecting to different apps. I can't think of an alternative in that case unfortunately.

That's probably something to be logged under Ideation.