How to see what is reserving ephemeral port ranges on Windows?
I have a Windows application that needs to use ports 50005 and 50006 but it is being blocked.
I see the following when I run netsh int ip show excludedportrange protocol=tcp:
Protocol tcp Port Exclusion Ranges
Start Port End Port
---------- --------
5357 5357
49709 49808
49809 49908
49909 50008
50009 50108
50109 50208
50280 50379
* - Administered port exclusions.
So something on my machine is reserving ports 49909 to 50008, which is presumably what is causing my application to fail. I've tried deleting this excludedportrange with the following command:
netsh int ip delete excludedportrange protocol=tcp numberofports=100 startport=49909
But I see an error Access is denied., which makes me think that whatever is reserving this ports is actively running, but I have no idea what that could be.
What's also weird is that after running that command, even though I saw an error, if I reboot the excludedportrange will be different.
As a sanity check I've also run resmon.exe and confirmed that there is nothing running on ports 50005 and 50006.
How can I tell what is adding the excludedportrange?
EDIT: I've narrowed this down to Hyper-V. If I disable Hyper-V then those ports are not excluded.
windows networking tcp port netsh
asked Jan 2 at 17:05
LiamLiam
69721117
|
show 1 more comment
I have a Windows application that needs to use ports 50005 and 50006 but it is being blocked.
I see the following when I run netsh int ip show excludedportrange protocol=tcp:
Protocol tcp Port Exclusion Ranges
Start Port End Port
---------- --------
5357 5357
49709 49808
49809 49908
49909 50008
50009 50108
50109 50208
50280 50379
* - Administered port exclusions.
So something on my machine is reserving ports 49909 to 50008, which is presumably what is causing my application to fail. I've tried deleting this excludedportrange with the following command:
netsh int ip delete excludedportrange protocol=tcp numberofports=100 startport=49909
But I see an error Access is denied., which makes me think that whatever is reserving this ports is actively running, but I have no idea what that could be.
What's also weird is that after running that command, even though I saw an error, if I reboot the excludedportrange will be different.
As a sanity check I've also run resmon.exe and confirmed that there is nothing running on ports 50005 and 50006.
How can I tell what is adding the excludedportrange?
EDIT: I've narrowed this down to Hyper-V. If I disable Hyper-V then those ports are not excluded.
windows networking tcp port netsh
asked Jan 2 at 17:05
LiamLiam
69721117
why dont you try executing the netstat -a -b to figure out manually what services are being executed at the given ports
– Ankur Goel
Jan 2 at 17:12
If your application depends on specific ports, you need to use user ports and register those ports with IANA: "Assigned ports both System and User ports SHOULD NOT be used without or prior to IANA registration."
– Ron Maupin
Jan 2 at 17:25
"Access is denied" probably just because you ran a command prompt without elevation. Only elevated administrator processes can make changes to the network settings
– Ben Voigt
Jan 2 at 17:32
@AnkurGoel Nothing appears to be using anything in those port ranges.
– Liam
Jan 2 at 17:55
@BenVoigt I'm running the command prompt as administrator.
– Liam
Jan 2 at 17:55
|
show 1 more comment
I have a Windows application that needs to use ports 50005 and 50006 but it is being blocked.
I see the following when I run netsh int ip show excludedportrange protocol=tcp:
Protocol tcp Port Exclusion Ranges
Start Port End Port
---------- --------
5357 5357
49709 49808
49809 49908
49909 50008
50009 50108
50109 50208
50280 50379
* - Administered port exclusions.
So something on my machine is reserving ports 49909 to 50008, which is presumably what is causing my application to fail. I've tried deleting this excludedportrange with the following command:
netsh int ip delete excludedportrange protocol=tcp numberofports=100 startport=49909
But I see an error Access is denied., which makes me think that whatever is reserving this ports is actively running, but I have no idea what that could be.
What's also weird is that after running that command, even though I saw an error, if I reboot the excludedportrange will be different.
As a sanity check I've also run resmon.exe and confirmed that there is nothing running on ports 50005 and 50006.
How can I tell what is adding the excludedportrange?
EDIT: I've narrowed this down to Hyper-V. If I disable Hyper-V then those ports are not excluded.
windows networking tcp port netsh
asked Jan 2 at 17:05
LiamLiam
69721117
I have a Windows application that needs to use ports 50005 and 50006 but it is being blocked.
I see the following when I run netsh int ip show excludedportrange protocol=tcp:
Protocol tcp Port Exclusion Ranges
Start Port End Port
---------- --------
5357 5357
49709 49808
49809 49908
49909 50008
50009 50108
50109 50208
50280 50379
* - Administered port exclusions.
So something on my machine is reserving ports 49909 to 50008, which is presumably what is causing my application to fail. I've tried deleting this excludedportrange with the following command:
netsh int ip delete excludedportrange protocol=tcp numberofports=100 startport=49909
But I see an error Access is denied., which makes me think that whatever is reserving this ports is actively running, but I have no idea what that could be.
What's also weird is that after running that command, even though I saw an error, if I reboot the excludedportrange will be different.
As a sanity check I've also run resmon.exe and confirmed that there is nothing running on ports 50005 and 50006.
How can I tell what is adding the excludedportrange?
EDIT: I've narrowed this down to Hyper-V. If I disable Hyper-V then those ports are not excluded.
windows networking tcp port netsh
windows networking tcp port netsh
asked Jan 2 at 17:05
LiamLiam
69721117
asked Jan 2 at 17:05
LiamLiam
69721117
edited Jan 2 at 19:29
Liam
asked Jan 2 at 17:05
LiamLiam
69721117
asked Jan 2 at 17:05
LiamLiam
69721117
asked Jan 2 at 17:05
LiamLiam
69721117
69721117
why dont you try executing the netstat -a -b to figure out manually what services are being executed at the given ports
– Ankur Goel
Jan 2 at 17:12
If your application depends on specific ports, you need to use user ports and register those ports with IANA: "Assigned ports both System and User ports SHOULD NOT be used without or prior to IANA registration."
– Ron Maupin
Jan 2 at 17:25
"Access is denied" probably just because you ran a command prompt without elevation. Only elevated administrator processes can make changes to the network settings
– Ben Voigt
Jan 2 at 17:32
@AnkurGoel Nothing appears to be using anything in those port ranges.
– Liam
Jan 2 at 17:55
@BenVoigt I'm running the command prompt as administrator.
– Liam
Jan 2 at 17:55
|
show 1 more comment
why dont you try executing the netstat -a -b to figure out manually what services are being executed at the given ports
– Ankur Goel
Jan 2 at 17:12
If your application depends on specific ports, you need to use user ports and register those ports with IANA: "Assigned ports both System and User ports SHOULD NOT be used without or prior to IANA registration."
– Ron Maupin
Jan 2 at 17:25
"Access is denied" probably just because you ran a command prompt without elevation. Only elevated administrator processes can make changes to the network settings
– Ben Voigt
Jan 2 at 17:32
@AnkurGoel Nothing appears to be using anything in those port ranges.
– Liam
Jan 2 at 17:55
@BenVoigt I'm running the command prompt as administrator.
– Liam
Jan 2 at 17:55
why dont you try executing the netstat -a -b to figure out manually what services are being executed at the given ports
– Ankur Goel
Jan 2 at 17:12
why dont you try executing the netstat -a -b to figure out manually what services are being executed at the given ports
– Ankur Goel
Jan 2 at 17:12
If your application depends on specific ports, you need to use user ports and register those ports with IANA: "Assigned ports both System and User ports SHOULD NOT be used without or prior to IANA registration."
– Ron Maupin
Jan 2 at 17:25
If your application depends on specific ports, you need to use user ports and register those ports with IANA: "Assigned ports both System and User ports SHOULD NOT be used without or prior to IANA registration."
– Ron Maupin
Jan 2 at 17:25
"Access is denied" probably just because you ran a command prompt without elevation. Only elevated administrator processes can make changes to the network settings
– Ben Voigt
Jan 2 at 17:32
"Access is denied" probably just because you ran a command prompt without elevation. Only elevated administrator processes can make changes to the network settings
– Ben Voigt
Jan 2 at 17:32
@AnkurGoel Nothing appears to be using anything in those port ranges.
– Liam
Jan 2 at 17:55
@AnkurGoel Nothing appears to be using anything in those port ranges.
– Liam
Jan 2 at 17:55
@BenVoigt I'm running the command prompt as administrator.
– Liam
Jan 2 at 17:55
@BenVoigt I'm running the command prompt as administrator.
– Liam
Jan 2 at 17:55
|
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why dont you try executing the netstat -a -b to figure out manually what services are being executed at the given ports
– Ankur Goel
Jan 2 at 17:12
If your application depends on specific ports, you need to use user ports and register those ports with IANA: "Assigned ports both System and User ports SHOULD NOT be used without or prior to IANA registration."
– Ron Maupin
Jan 2 at 17:25
"Access is denied" probably just because you ran a command prompt without elevation. Only elevated administrator processes can make changes to the network settings
– Ben Voigt
Jan 2 at 17:32
@AnkurGoel Nothing appears to be using anything in those port ranges.
– Liam
Jan 2 at 17:55
@BenVoigt I'm running the command prompt as administrator.
– Liam
Jan 2 at 17:55