Hi Alex,
Alex wrote:
Hello,
the 408 timeout was locally generated by openser or was received? if it
is the first case, was there any provisional reply received from UAS?
Locally generated by server. It was first try to send packet to another server which was off-line.
Another requests were not sent and 477 was returned by server.
yes - this is a typical case of DNS-based server - your openser detected
the destination server as non-responsive and blocked all requests to if
for the short period of time (4 minutes) - this a self protection
mechanism to avoid bottlenecks and DOS against unreachable destinations.
regards,
bogdan
I'm asking because a local generated 408 timeout with no reply received
is considered a failure that triggers DNS-based failover (RFC3262) and
if disable_dns_blacklist=no, the destination IP address will be
blacklisted for 4 minutes.
can you check if this was the case?
you can inspect the content of the blacklist via MI command
"list_blacklists"
200 OK
List:: dns owner=17 flags=6
Rule:: flags=0
IP:: ip
Mask:: 255.255.255.255
Proto:: 1
Port:: port
Expire:: 556
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