office 365 - Outlook error 0x800CCC1A

There may several reasons behind on error 0x800ccc1a:
• A damaged Outlook profile
• Incorrect port number
• Anti-virus issue
• A corrupted PST file

Please refer below URL if it can help:

https://www.experts-exchange.com/articles/35951/4-solutions-to-fix-the-Outlook-error-0x800ccc1a.html