Hello,

when this happens, can you look at the cache content and see if the corresponding record has negative_entry set to yes? If that's the case, the record was marked as bad (unresolvable due to a failed dns query or maybe blocklisting activated on 503).

Cheers,
Daniel

Aloha,

I'm experiencing this internal DNS problem with Kamailio, can't seem to figure out what's causing it. Maybe someone can help.

Essentially, from time to time (one or two times a day) this situation happens, starting with logs:

linux kamailio[773]: ERROR: uac [uac_reg.c:1163]: uac_reg_send(): failed to send request for [some-uuid]
linux kamailio[773]: ERROR: <core> [core/resolve.c:1730]: sip_hostport2su(): could not resolve hostname: "my.domain.net"
linux kamailio[773]: ERROR: tm [ut.h:309]: uri2dst2(): failed to resolve "my.domain.net"
linux kamailio[773]: ERROR: tm [uac.c:480]: t_uac_prepare(): no socket found

# Do a Kamailio internal DNS lookup, no results found???
root@linux:~# kamcmd dns.lookup a my.domain.net
error: 400 - Not found

# Do a system DNS lookup. All good.
root@linux:~# dig my.domain.net
;; QUESTION SECTION:
;my.domain.net. IN A
;; ANSWER SECTION:
my.domain.net. 18000 IN A 192.168.0.1

# Delete internal Kamailio DNS record
root@linux:~# kamcmd dns.delete_a my.domain.net

# Lookup again right away. It's there, problem fixed. Why??
root@linux:~# kamcmd dns.lookup a my.domain.net
{
  name: my.domain.net
  type: A
  size_bytes: 120
  reference_counter: 2
  permanent: no
  expires: 7674
  last_used: 0
  negative_entry: no
  records: {
      {
         rr_idx: 0
         rr_ip: 192.168.0.1
         rr_permanent: no
         rr_expires: 7674
      }
   }
}

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