If Windows Defender Firewall or any antivirus tool is turned on, make sure to configure them to allow the port number to go through, otherwise, connection errors may occur.
You would need to configure the firewall/antivirus settings on the following servers:
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Web server (such as IIS)
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Database server
The steps are the same.
Step 1: Open Windows Defender Firewall and then click Advanced settings.
Step 2: Select Inbound Rules and then click New Rule.
Step 3: Create a new rule which allows connections through the server port (for example, 2638).
