Office365 migration

We have a hybrid office365 environment with exchange 2010. We recently had an issue with receiving external email. Apparently recreating the send connector resolved that issue. Now I have the problem with migrating mailboxes to office365. It complains about accessing the FQDN server. When I look at the on prem server I see that event id 1035 and 6004 logged. When I look at 1035 The IP address it shows is an IP address on our domain but not sure why anything on that server is trying to access exchange. It is a sever running other application. When I look at event id 6004, the time time stamp of the log file is years old. I attached the event log.
Event_Log.txt
InSearchOfAsked:
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RoninCommented:
While in Hybrid your Exchange must be on the latest or n-1 version of CU.
Provide the result of the following command please:
Get-Command Exsetup.exe | ForEach-Object {$_.FileVersionInfo}

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InSearchOfAuthor Commented:
This is what I got.

ProductVersion   FileVersion      FileName
--------------   -----------      --------
14.03.0361.001   14.03.0361.001   D:\Microsoft\Exchange Server\V14\bin\ExSetup.exe
RoninCommented:
It complains about accessing the FQDN server.
In order to migrate mailbox office365 requires access over HTTPS (443) to the Exchange server.
Can you please confirm you have the port open and accessible from the internet?
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InSearchOfAuthor Commented:
Well, if I do netstat -an on my exchange server I see port 443 is listening
RoninCommented:
You need to validate it's accessible from the internet, that's what your posted error is saying.
Marshal HubsEmail ConsultantCommented:
You can easily migrate mailboxes to office365 with the help of Stellar EDB to PST Converter. You need to select user mailbox and select Office365 option. For more information, please check this link: https://www.stellarinfo.com/support/kb/index.php/article/convert-offline-edb-to-office365
InSearchOfAuthor Commented:
how can I verify port 443 is accessible from the internet
RoninCommented:
Test if your Exchange accessible from the Internet:
https://testconnectivity.microsoft.com/
Sandeep KumarAssociate ConsultantCommented:
Hope that port is verified now. If its done, then by using Kernel for Exchange Server Recovery software, you can easily migrate Exchange mailboxes to Office 365. Visit https://www.nucleustechnologies.com/exchange-edb-to-office-365-migration.html to know steps and features for migration of Exchange EDB mailbox to Office 365.

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