split thread. hello bertel, kindly note that we have used hybrid configuration wizard (hcw) exchange 2013 office 365, , completed. this wizard created send/receive connectors, default didn't touch them , didn't edit configuration. the outbound send connector office 365 on premise server, forward emails our real ip. and on error mentioned ip: "reason: [{led=450 4.4.318 connection closed abruptly (suspiciousremoteservererror)};{msg=};{fqdn=our fqdn};{ip=our real ip};{lrt=7/11/2017 2:47:21 pm}]. outboundproxytargetip: 205.177.180.161. outboundproxytargethostname: our fqdn" i guess traffic forwarded office 365 our firewalls refused here on our enviroment. my question is: rules or policies should applied on firewall sides ? opened 25 traffic no luck. please advise, thanks in advance, hassan al kak hi hassan, office 365 ip lists may changed , please have check, make
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