I am using Firefox 44.0 and here is the trace from it.
TRACE: The url is: /api/v1/clusters/hwtest?fields=Clusters/health_report,Clusters/total_hosts,alerts_summary_hosts&minimal_response=true app.js:154162:7
Status code 200: Success. app.js:54173:3
App.componentsStateMapper execution time: timer started app.js:55315
App.componentsStateMapper execution time: 29.04ms app.js:55360
TRACE: The url is: /api/v1/clusters/hwtest/host_components?fields=HostRoles/component_name,HostRoles/host_name&minimal_response=true app.js:154162:7
Status code 200: Success. app.js:54173:3
TRACE: The url is: /api/v1/clusters/hwtest/configurations?type=cluster-env app.js:154162:7
Status code 200: Success. app.js:54173:3
App.componentConfigMapper execution time: timer started app.js:55076
App.componentConfigMapper execution time: 5.95ms app.js:55125
Config validation failed: Object { readyState: 4, setRequestHeader: .ajax/v.setRequestHeader(), getAllResponseHeaders: .ajax/v.getAllResponseHeaders(), getResponseHeader: .ajax/v.getResponseHeader(), overrideMimeType: .ajax/v.overrideMimeType(), abort: .ajax/v.abort(), done: f.Callbacks/p.add(), fail: f.Callbacks/p.add(), progress: f.Callbacks/p.add(), state: .Deferred/h.state(), 14 more… } error Internal Server Error Object { type: "POST", timeout: 180000, dataType: "json", statusCode: Object, headers: Object, url: "/api/v1/stacks/HDP/versions/2.3/val…", data: "{"hosts":["falbdcdq0001v.farmersinsurance.com","falbdcdq0002v.farmersinsurance.com","falbdcdq0003v.farmersinsurance.com","falbdcdq0004v.farmersinsurance.com","falbdcdq0005v.farmersinsurance.com","falbdcdq0006v.farmersinsurance.com","falbdcdq0007v.farmersinsurance.com"],"services":["AMBARI_METRICS","ATLAS","FALCON","FLUME","HBASE","HDFS","HIVE","KAFKA","KNOX","MAPREDUCE2","OOZIE","PIG","RANGER","RANGER_KMS","SPARK","SQOOP","STORM","TEZ","YARN","ZOOKEEPER"],"validate":"configurations","recommendations":{"blueprint":{"host_groups":[{"name":"host-group-1","components":[{"name":"FALCON_CLIENT"},{"name":"HBASE_CLIENT"},{"name":"HDFS_CLIENT"},{"name":"HCAT"},{"name":"HIVE_CLIENT"},{"name":"MAPREDUCE2_CLIENT"},{"name":"OOZIE_CLIENT"},{"name":"PIG"},{"name":"SPARK_CLIENT"},{"name":"SQOOP"},{"name":"TEZ_CLIENT"},{"name":"YARN_CLIENT"},{"name":"ZOOKEEPER_CLIENT"},{"name":"METRICS_MONITOR"},{"name":"FALCON_CLIENT"},{"name":"HBASE_CLIENT"},{"name":"HCAT"},{"name":"HDFS_CLIENT"},{"name":"HIVE_CLIENT"[…], context: Object, beforeSend: ajax<.send/opt.beforeSend(), success: ajax<.send/opt.success(), 2 more… } app.js:64175:5
Error code 500: Internal Error on server side. app.js:54195:3
Config validation failed. Going ahead with saving of configs app.js:64188:7
TRACE: The url is: /api/v1/clusters?fields=Clusters/provisioning_state app.js:154162:7
Status code 200: Success. app.js:54173:3
TRACE: The url is: /api/v1/clusters/hwtest/requests?to=end&page_size=10&fields=Requests app.js:154162:7
Status code 200: Success. app.js:54173:3
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