Why is the Http Even tCollector LogbackAppender is hanging on connection request?

[davemforeflight]

Logs look like:

o.a.http.impl.nio.client.MainClientExec : [exchange: 2] start execution
2018-06-20 16:00:04.014 DEBUG 44700 --- [ main] o.a.h.client.protocol.RequestAddCookies : CookieSpec selected: standard
2018-06-20 16:00:04.014 DEBUG 44700 --- [ main] o.a.h.client.protocol.RequestAuthCache : Auth cache not set in the context
2018-06-20 16:00:04.015 DEBUG 44700 --- [ main] o.a.h.i.n.c.InternalHttpAsyncClient : [exchange: 2] Request connection for {s}->https://input-prd-p-XXXXX.cloud.splunk.com:8088

I have disableCertificateValidation set to true (and can submit json logs via curl and postman). I've also tried adding the clound.splunk.com cert to a trustStore.

Any ideas?

[davemforeflight · Accepted solution]

SOLVED:

SpringBoot environment with and unreachable Spring Configuration Server. The attempted connection to the config server was blocking the entire app boot process just after the log stack started. So looked like the log stack was hanging, but was really the spring context not starting.

Derp.