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eLTE terminal attach fail - "unknown or missing APN"

Publication Date:  2019-01-14 Views:  215 Downloads:  0
Issue Description

Freshly commissioned test eLTE network will not accept terminals, which will continue displaying "no network".

In the user trace captured from the cloudUSN OMO we see "Attach reject" and "normal release".



Alarm Information

no alarms is issued nor on the eNodeB or the eCNS280

Handling Process

Looking further into the error messages in the user trace we find EMS_SIGNALING_ABNORMAL with uwProtocolCause: esm-cause-unknown-or-missing-apn(27) and udwInnerCause: usn-sm-upsel-apn-dns-target-qry-hostfile-fqdn-not-found(1357187173)


"FQDN" not found suggest a DNS query fail, we look furthet at "SM_DNS_REQ" and "DSN_SM_RSP" messages:


Find that from the 2 targets that are queried only one is successfully resolved:


Target 1 being: TAC-LB01.TAC-HB00.TAC.EPC.MNC060.MCC460.3GPPNETWORK.ORG - successful

and Target 2 being: ELTE.APN.EPC.MNC060.MCC460.3GPPNETWORK.ORG - failed


Root Cause

Finally we take a look back into the configuration script of the cloudUSN OMO to see if there is the line for target2 ( ELTE.APN.EPC.MNC060.MCC460.3GPPNETWORK.ORG) and actually it is missing:



Solution

What we've found instead in the configuration file was DNS entry for APN "TD-Tech.com" and not for the APN "eLTE" that was actually queried:

ADD DNSN:FQDN="TD-TECH.COM.APN.EPC.MNC060.MCC460.3GPPNETWORK.ORG",HSINDEX=3,ENTITY=PGW,INTYPE=S5,S5PROTOCOL=GTP_PMIP,S8PROTOCOL=GTP_PMIP,TO_VNFC="omo";

The APN has been customized, but not all the corresponding fields were updated in EasyGo V1.5.26:


The solution was to replace td-tech.com with elte in the following line:

ADD DNSN:FQDN="TD-TECH.COM.APN.EPC.MNC060.MCC460.3GPPNETWORK.ORG",HSINDEX=3,ENTITY=PGW,INTYPE=S5,S5PROTOCOL=GTP_PMIP,S8PROTOCOL=GTP_PMIP,TO_VNFC="omo";


END