Thanks Miyako,

This link:
    
https://serverfault.com/questions/648424/windows-server-2012-r2-runs-out-of-ephemeral-ports-though-it-shouldnt
... seems like it's leading me on the right path.
I'm having our IT guys follow up on that.



On 12/14/18, 8:26 PM, "4D_Tech on behalf of Keisuke Miyako via 4D_Tech" 
<[email protected] on behalf of [email protected]> wrote:

    quick Google results, so don't quote me on this
    
    
https://support.microsoft.com/en-us/help/832017/service-overview-and-network-port-requirements-for-windows
    
    other pages (old, window server 2008-ish)
    says the number socket ports is 65535-49152=16383
    but the range can be expanded with "netsh"
    
    e.g
    
    netsh int ipv4 set dynamicport tcp start=1025 num=64511
    
    
https://support.microsoft.com/en-gb/help/929851/the-default-dynamic-port-range-for-tcp-ip-has-changed-in-windows-vista
    
    see also
    
    
https://serverfault.com/questions/648424/windows-server-2012-r2-runs-out-of-ephemeral-ports-though-it-shouldnt
    
    This feels like some kind of TCP overload to me.
    
    
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