From the PSTFileScan_Output.log:
2018-09-14 13:40:25,731 ERROR [adapter] (22492:null) EsaError: 15003 WinError: 0x80040401 hRes: 0x80040401 [MAPI_E_TIMEOUT] at: CEsaMapiProfile::m_configProfile(). Profile ESA_SCAN7_1fb1ed70ed8d6c7deb83a550d33c3808.
From the Windows System Event Log:
Log Name: System
Source: Service Control Manager
Date: 9/17/2018 11:32:09 AM
Event ID: 7011
Task Category: None
Level: Error
Keywords: Classic
User: N/A
Computer: server.company.com
Description:
A timeout (30000 milliseconds) was reached while waiting for a transaction response from the EsaPstCrawlerService service.
N/A
1. Uninstall Security Update for Windows (KB4343900).
2. Restart the server.