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Library Server has failed to start

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RedJ:
Since upgrading to MC27 (on Monday), I've been unable to start a Media Server using the standard port 52199. I can start the server on another port as long as it isn't in the 51661-54999 block, so it can run. If running on another port outside this range, it says the library is not reachable from the internet, however that is incorrect, it works just fine (with port forwarding adjusted).

I have spent days trying to solve this on my own, but can't crack it. Here's what I've done to date:

* I have checked all active ports and confirmed there is nothing using these ports.
* disabled the firewall
* disabled any and all virus/malware protection
* reset the router and switch
* uninstalled all other versions of MC
* uninstalled all version of MC, 27 included, using full remove registry and libraries method
* started from an absolutely pristine version of MC27, with no imported library, tracks, or settings
* deleted firewall rules for all Media Center related entries and let them be automatically re-added by MC use
* Checked firewall logs for dropped connection to the port (no drops anywhere and also have also turned the firewall off without difference)
* countless reboots in-between stepsThis behavior has remained constant since the initial upgrade to 27, although there's nothing that guarantees it actually triggered the problem. While I can now use the library fine, I'd love to solve this since the port number is rather ingrained in my habits after 2+ decades of use- not to mention it bothers me that this problem remains unexplained.

JimH:
Something still running on that port?

RedJ:
I have checked using a number of different methods and port 52199 is not being used by anything.

--- Quote from: JimH on September 17, 2020, 10:31:38 am ---Something still running on that port?

--- End quote ---

JimH:
Firewall?

RedJ:

--- Quote from: JimH on September 17, 2020, 12:07:45 pm ---Firewall?

--- End quote ---
Here's what I've done to date:

* I have checked all active ports and confirmed there is nothing using these ports.
* disabled the firewall
* disabled any and all virus/malware protection
* reset the router and switch
* uninstalled all other versions of MC
* uninstalled all version of MC, 27 included, using full remove registry and libraries method
* started from an absolutely pristine version of MC27, with no imported library, tracks, or settings
* deleted firewall rules for all Media Center related entries and let them be automatically re-added by MC use
* Checked firewall logs for dropped connection to the port (no drops anywhere and also have also turned the firewall off without difference)
* countless reboots in-between steps

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