Comments
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I have no reference about the use of port TCP 51200 by Zyxel. Like you, I'm using Port Forwarding for another service with no problem. Probably there is something about the Synology Backup Program that the USG FLEX family don't like. But what I don't understand is why the USG don't have the TCP 51200 traffic and the USG…
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The Assistance says that there is a fantomatic communication throw the TCP Port 51200, communication that not affect the USG 40. I don't understand.
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I am currently using "V5.31 (ABUH.0)". I had installed the beta version "V5.31 (ABUH.0) ITS-22WK31-r104914" but to no avail. I am waiting to install the new "5.32 (ABUH.0)" because I have an error during the automatic update. But after 8 days with no response from Support, I will install tomorrow.