The A2A client 'Connection Status' PAM shows as yellow inhibiting users from running scripts from the client server(s) in this state. Stopping and starting the client sometimes helps.
During this time the following may be observed from the A2A client log (Credentials > Manage A2A > Clients > <select the client> > Get Logs):
WARNING: Fri May 18 10:17:41.515 EDT 2018 CSPMService::doPost. Failed to process event: UNKNOWN, exception: null
[Fatal Error] :1:1: Content is not allowed in prolog.
org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 1; Content is not allowed in prolog.