Well, i'm using latest 3.10.0 build on my test machine too. But i'm using Spark 2.7.0 latest build. Though this shouldn't matter, but still (http://bamboo.igniterealtime.org/artifact/SPARK-INSTALL4J/shared/build-668/Insta ll4j/spark_2_7_0_668.exe )
Oh, SSL/TLS with SparkWeb is tricky. I have tried to find out how it works many years ago, but i'm still not sure. Have tried to compile a howto for it, but it is now old and some files may be not available anymore SparkWeb HOW-TO
It says, that even if you have SparkWeb on a https site, it is still a client side flash application and once it is downloaded by a browser, then it connects to Openfire server, but not via SSL. The only SSL version by this howto is the Red5 SparkWeb (which uses Old SSL). But it will involve even more testing