One companies network is unable to access my Google App Engine website, anyone else having this issue? -

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the website accessible else , online websites check see if website accessible come positive.

this 1 organization, used able access website, of sudden unable access website other day. they've tried multiple computers in organization, keeps telling them website isn't able found. conclusion can come issue way network setup; cache, dns, needs whitelisted? have no way of knowing. people have no idea , it's hard solve issue network have no access to.

i'm think following causing problem, https://cloud.google.com/appengine/kb/?hl=en#static-ip

even knowing this, have no idea how resolve it. possible setup dedicated instance website , attach ip address instance , serve them single instance through maybe, backdoor.website.com or similar? ideas/suggestions welcome.

on gae app side make sure don't have network blacklisted in dos protection configuration.

on network side first check if host+domain name of server resolves 1 (or more) ip addresses. if doesn't dns service needs investigated (the issue either inside network in dns caching/forwarding configs, or outside @ 1 of external dns providers).

if dns resolving produces ip addresses check addresses (instead of using server's host+domain name) on network (assuming network doesn't have outgoing restrictions). if doesn't work issue dns mapping problem. info should people debug dns service.

otherwise it's networking issue. check logs of app, looking requests network's external ip address(es). if don't see such requests means request don't make app. if see requests means app's replies don't make them. info people debug network or internet provider service looking possible routing issues, access control list (acl) configs, etc.


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