High count of connections by client IP on many ports

Original query, unchanged.

let timeBin = 10m;
let portThreshold = 30;
W3CIISLog
| extend scStatusFull = strcat(scStatus, ".",scSubStatus)
// Map common IIS codes
| extend scStatusFull_Friendly = case(
scStatusFull == "401.0", "Access denied.",
scStatusFull == "401.1", "Logon failed.",
scStatusFull == "401.2", "Logon failed due to server configuration.",
scStatusFull == "401.3", "Unauthorized due to ACL on resource.",
scStatusFull == "401.4", "Authorization failed by filter.",
scStatusFull == "401.5", "Authorization failed by ISAPI/CGI application.",
scStatusFull == "403.0", "Forbidden.",
scStatusFull == "403.4", "SSL required.",
"See - https://support.microsoft.com/help/943891/the-http-status-code-in-iis-7-0-iis-7-5-and-iis-8-0")
// Mapping to Hex so can be mapped using website in comments above
| extend scWin32Status_Hex = tohex(tolong(scWin32Status))
// Map common win32 codes
| extend scWin32Status_Friendly = case(
scWin32Status_Hex =~ "775", "The referenced account is currently locked out and cannot be logged on to.",
scWin32Status_Hex =~ "52e", "Logon failure: Unknown user name or bad password.",
scWin32Status_Hex =~ "532", "Logon failure: The specified account password has expired.",
scWin32Status_Hex =~ "533", "Logon failure: Account currently disabled.",
scWin32Status_Hex =~ "2ee2", "The request has timed out.",
scWin32Status_Hex =~ "0", "The operation completed successfully.",
scWin32Status_Hex =~ "1", "Incorrect function.",
scWin32Status_Hex =~ "2", "The system cannot find the file specified.",
scWin32Status_Hex =~ "3", "The system cannot find the path specified.",
scWin32Status_Hex =~ "4", "The system cannot open the file.",
scWin32Status_Hex =~ "5", "Access is denied.",
scWin32Status_Hex =~ "8009030e", "SEC_E_NO_CREDENTIALS",
scWin32Status_Hex =~ "8009030C", "SEC_E_LOGON_DENIED",
"See - https://msdn.microsoft.com/library/cc231199.aspx")
// decode URI when available
| extend decodedUriQuery = url_decode(csUriQuery)
// Count of attempts by client IP on many ports
| summarize makeset(sPort), makeset(decodedUriQuery), makeset(csUserName), makeset(sSiteName), makeset(sPort), makeset(csUserAgent), makeset(csMethod), makeset(csUriQuery), makeset(scStatusFull), makeset(scStatusFull_Friendly), makeset(scWin32Status_Hex), makeset(scWin32Status_Friendly), ConnectionsCount = count() by bin(TimeGenerated, timeBin), cIP, Computer, sIP
| extend portCount = arraylength(set_sPort)
| where portCount >= portThreshold
| project TimeGenerated, cIP, set_sPort, set_csUserName, set_decodedUriQuery, Computer, set_sSiteName, sIP, set_csUserAgent, set_csMethod, set_scStatusFull, set_scStatusFull_Friendly, set_scWin32Status_Hex, set_scWin32Status_Friendly, ConnectionsCount, portCount
| order by portCount