How to Troubleshoot IO.Exception: Premature Close?

Hi,

for some reason I’m unable to call our keycloak server with gatling 3.1.3. Other uris/servers work.

The keycloak server uses the companies dev ca for it’s certs. I created a truststore and configured it in conf/gatling.conf:

truststore { type = "jks" file = "C:/certs/truststore.jks" password = "pswd" }

Using this trustore, the keycloak server is accessable using apache http client in a test java application. curl with -k also works.

Running a gatling scenario which only calls the keycloak server 1 time returns the following:

`
09:22:34.510 [DEBUG] i.g.h.e.t.HttpTxExecutor - Sending request=Request Token uri=https://tokenmanager-dev.intranet.mycompany.com/auth/realms/internal/protocol/openid-connect/token: scenario=myScenario, userId=1
09:22:34.557 [DEBUG] i.g.h.c.i.DefaultHttpClient - Installing SslHandler for https://tokenmanager-dev.intranet.mycompany.com/auth/realms/internal/protocol/openid-connect/token
09:22:34.571 [DEBUG] i.n.u.ResourceLeakDetectorFactory - Loaded default ResourceLeakDetector: io.netty.util.ResourceLeakDetector@1a0a6e11
09:22:35.147 [DEBUG] i.g.h.c.i.HttpAppHandler - Write request WritableRequest{request=DefaultFullHttpRequest(decodeResult: success, version: HTTP/1.1, content: UnpooledHeapByteBuf(ridx: 0, widx: 134, cap: 134/134))
POST /auth/realms/internal/protocol/openid-connect/token HTTP/1.1
User-Agent: Gatling
accept: /
host: tokenmanager-dev.intranet.mycompany.com
content-type: application/x-www-form-urlencoded
content-length: 134, content=null}
09:22:35.209 [DEBUG] i.n.h.s.SslHandler - [id: 0x377215f9, L:/133.0.50.134:65142 - R:tokenmanager-dev.intranet.mycompany.com/140.8.12.161:443] HANDSHAKEN: TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256

[20 seconds of waiting …]

09:22:55.269 [DEBUG] i.n.h.s.ReferenceCountedOpenSslEngine - SSL_shutdown failed: OpenSSL error: 268435650 error:100000c2:SSL routines:OPENSSL_internal:PROTOCOL_IS_SHUTDOWN
09:22:55.272 [WARN ] i.g.h.e.GatlingHttpListener - Request ‘Request Token’ failed for user 1
io.gatling.http.client.impl.HttpAppHandler$1: Premature close
09:22:55.316 [WARN ] i.g.h.e.r.DefaultStatsProcessor - Request ‘Request Token’ failed for user 1: j.i.IOException: Premature close
`

Any idea how to proceed from here?