diff --git a/build.xml b/build.xml
index f75314e044..625b234a8f 100644
--- a/build.xml
+++ b/build.xml
@@ -257,6 +257,7 @@
         <string>--add-opens java.base/java.lang=ALL-UNNAMED</string>
         <string>--add-opens java.base/java.math=ALL-UNNAMED</string>
         <string>--add-opens java.base/java.lang.reflect=ALL-UNNAMED</string>
+        <string>--add-opens java.base/java.net=ALL-UNNAMED</string>
     </resources>
     <pathconvert property="_jvm_args_concat2" refid="_jvm17_arg_items" pathsep=" "/>
     <condition property="java17-jvmargs" value="${_jvm_args_concat2}" else="">
diff --git a/conf/jvm17-server.options b/conf/jvm17-server.options
index 3e8d2cef76..98a70a20f9 100644
--- a/conf/jvm17-server.options
+++ b/conf/jvm17-server.options
@@ -103,6 +103,8 @@
 --add-opens java.base/java.math=ALL-UNNAMED
 #in-jvm tests? plus # https://chronicle.software/chronicle-support-java-17/
 --add-opens java.base/java.lang.reflect=ALL-UNNAMED
+#jamm post CASSANDRA-17199
+--add-opens java.base/java.net=ALL-UNNAMED
 
 ### GC logging options -- uncomment to enable