Hello,
Tooltip and URL syntax has been slightly changed. See http://plantuml.com/link
Your example should be rewrite as :
@startuml
L2SIP->UCC [[{{\n "id" : "tid.L2Sip_a4742780-8d21df54-24eb35-4d86200a@10.32.134.77",\n "time" : "2017-03-22T20:32:20.391Z",\n "msgType" : "http.req",\n "msg" : {\n "ua" : "WX2_L2SIP/5199 (wpsjc-prod)",\n "uid" : "de5de166-7c44-462a-abc3-72b0e0b93e99",\n "tid" : "L2Sip_a4742780-8d21df54-24eb35-4d86200a@10.32.134.77",\n "path" : "/ucm-service/api/v1/userDiscovery",\n "method" : "GET",\n "query" : "directoryURI=4084743372%40abc.com"\n },\n "srcType" : "L2SIP",\n "src" : {\n "ip" : "66.114.165.37",\n "port" : 33404\n },\n "dstType" : "UCC",\n "dst" : {\n "ip" : "10.254.2.146",\n "port" : 61339,\n "thread" : "nioconnector5"\n }\n}}]] : [GET] /ucm-service/api/v1/userDiscovery [2017-03-22T20:32:20.391Z]
@enduml
Notice that the ":" has been moved
This example is not working on the online server because the server does not accept too long lines (this limitation does not occur with on premise installation)
Hope this helps!