Fix: Acrobat failed to connect to a DDE server.
If you attempt to open a PDF file, you receive an error message: Fatal Error: Acrobat failed to connect to a DDE server. If this error suddenly started, it may be related to an Anti-Virus program you installed or enabled on your machine. Check to ensure there are no firewall rules that are blocking Adobe Acrobat or disable your Anti-Virus software.
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