Read the statement by Michael Teeuw here.
[MMM-Remote-Control] Can not access remote control module
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 changed something, now webpage shows: my connection has been rejected? 
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 @Mr-Gysy so, steps to debug from another system can u access the mirror itself 
 http://ip:port
 if no, then either firewall, or mirror config prevents.
 address: or whitelist or bothif address is localhost, then ONLY apps on the SAME PHYSICAL system can access 
 if address is 0.0.0.0, then apps can access from any network connection
 if address is something else, some specific ip, then apps can only access server thru the hardware adapter that provdes that address. think if u had two network cards, and wanted to restrict access to only one of those cards…now, once you’ve got that 
 we go to whitelist
 now you can constrain access to specific systems on that netwokr, or groups of systems by address range (or applied mask)so, to start I’d do address: “0.0.0.0” and whitelist :[], 
 means any system from any networkcan u access the mirror app now can u access the remotecontrol app insde the mirror? 
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 adress is set on 0.0.0.0 
 and whitelist []on pi itself same from browser : 192.168.178.40 rejected the connection 
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 @Mr-Gysy said in [MMM-Remote-Control] Can not access remote control module: 192.168.178.40 need the port too http://192.168.178.40:8080 (thats the default port) 
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 @Mr-Gysy remove after the port. Let’s make sure default works 
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  same :/ 
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 @Mr-Gysy ok. Check the address of the pi sudo ifconfig 
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 sudo ipconfig sudo: ipconfig: Command not found thats not good :/ 
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 ifconfig worked  
