Forum Discussion
NN_210021
Nimbostratus
NimbostratusCurl perform failed: Couldn't resolve host name (6)
Hi all,
can anyone give me a hint on what causes this error ? Can't find anything on DC /internet search
HTTP module: authenticateUser(): Curl perform failed: Couldn't resolve host name (6)
Thanks !
22 Replies
Hannes_RappPerhaps the easiest things first - does the service name itself resolve to an IP-address? Try the command below:
"host " , e.g. "host www.google.com".
NN_210021Hi, using your command results in HOST www.google.com not found: 2(SERVFAIL)
Hannes_Rapp_162Nacreous
Perhaps the easiest things first - does the service name itself resolve to an IP-address? Try the command below:
"host " , e.g. "host www.google.com".
- NN_210021Hi, using your command results in HOST www.google.com not found: 2(SERVFAIL)
- Kevin_Stewart
Employee
What are you trying to do? Is this an APM configuration? Do you by chance how route domains configured?
- Kevin_Stewart
There is exactly one other post on the forum with this same issue, and it was related to OTP.
So the error suggests that the OTP provider here can't resolve the hostname, which implies a DNS issue. Do you have DNS configured on the box? Can you resolve the hostname from the command line?
- Hannes_Rapp_162
To sort out the DNS issues, try to follow the steps below:
Check to see if you have a DNS server configured hannesr@(lb01)(cfg-sync Changes Pending)(Active)(/Common)(tmos) list sys db dns.nameservers sys db dns.nameservers { value "10.199.22.2 10.199.22.6" } hannesr@(lb01)(cfg-sync Changes Pending)(Active)(/Common)(tmos) q Check to see if you have DNS server connectivity [hannesr@lb01:Active:Changes Pending] config dig blabla ; <<>> DiG 9.9.6-P2 <<>> blabla ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 58826 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;blabla. IN A ;; AUTHORITY SECTION: . 10688 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2015080300 1800 900 604800 86400 ;; Query time: 1 msec ;; SERVER: 10.199.22.253(10.199.22.2) ;; WHEN: Mon Aug 03 12:08:38 UTC 2015 ;; MSG SIZE rcvd: 110- Hannes_Rapp_1621) If you don't have a DNS server configured - configure one. 2) If you don't receive any response to dig command - make sure you have UDP/53 connectivity to the DNS server. 3) If both commands succeed, assume that DNS on F5 is OK and you must update the DNS server's configuration to include a new A entry for your service name. When done, retry your cURL command. Good luck!
- NN_210021So heres the outcome: sys db.nameservers { value "10.128.20.252 10.128.128.1.243" } for the dig command: ; <<>> DiG 9.9.5 <<>> blabla ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 62411 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4000 ;; QUESTION SECTION: ;blabla. IN A ;; Query time: 29 msec ;; SERVER: 10.128.1.24353(10.128.1.243) ;; WHEN: Mon Aug 03 14:25:38 UTC 2015 ;; MSG SIZE rcvd: 35
- Hannes_Rapp_162DNS config on your F5 is in place. Furthermore, you don't have any connectivity problems to a DNS server. What is the outcome if you issue the command "host YourServiceName" ? Replace YourServiceName with the actual name you're using in the cURL command.
- Hannes_Rapp
To sort out the DNS issues, try to follow the steps below:
Check to see if you have a DNS server configured hannesr@(lb01)(cfg-sync Changes Pending)(Active)(/Common)(tmos) list sys db dns.nameservers sys db dns.nameservers { value "10.199.22.2 10.199.22.6" } hannesr@(lb01)(cfg-sync Changes Pending)(Active)(/Common)(tmos) q Check to see if you have DNS server connectivity [hannesr@lb01:Active:Changes Pending] config dig blabla ; <<>> DiG 9.9.6-P2 <<>> blabla ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 58826 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;blabla. IN A ;; AUTHORITY SECTION: . 10688 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2015080300 1800 900 604800 86400 ;; Query time: 1 msec ;; SERVER: 10.199.22.253(10.199.22.2) ;; WHEN: Mon Aug 03 12:08:38 UTC 2015 ;; MSG SIZE rcvd: 110- Hannes_Rapp1) If you don't have a DNS server configured - configure one. 2) If you don't receive any response to dig command - make sure you have UDP/53 connectivity to the DNS server. 3) If both commands succeed, assume that DNS on F5 is OK and you must update the DNS server's configuration to include a new A entry for your service name. When done, retry your cURL command. Good luck!
- NN_210021So heres the outcome: sys db.nameservers { value "10.128.20.252 10.128.128.1.243" } for the dig command: ; <<>> DiG 9.9.5 <<>> blabla ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 62411 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4000 ;; QUESTION SECTION: ;blabla. IN A ;; Query time: 29 msec ;; SERVER: 10.128.1.24353(10.128.1.243) ;; WHEN: Mon Aug 03 14:25:38 UTC 2015 ;; MSG SIZE rcvd: 35
- Hannes_RappDNS config on your F5 is in place. Furthermore, you don't have any connectivity problems to a DNS server. What is the outcome if you issue the command "host YourServiceName" ? Replace YourServiceName with the actual name you're using in the cURL command.
