If you haven't already done so, check your current RESOLVER configuration by entering the following MVS command string, as shown below:
F RESOLVER,,DISPLAY Display Displays the current resolver setup statement values, including the name of the most recently used resolver setup file. If the autonomic quiescing of unresponsive name server function is active, the resolver also displays the status of the name servers specified on NSINTERADDR statements in the global TCPIP.DATA file. The above is from "z/OS Communications Server: z/OS 3.1 Communications Server: IP System Administrator's Commands". Examples of what you may get back are located in the same manual. Regards, Mark Regan, K8MTR General, EN80 CTO1 USNR-Retired (1969-1991), Nationwide Insurance, Retired (1986-2017), z/OS Network Infrastructure Engineering Consultant Checks & Balances, Contractor w/Nationwide Ins. (2021-2023) Epsilon Inc., Contractor (2023-Present), z/OS Network Systems Programmer On Wed, Jun 4, 2025 at 4:45 PM Phil Smith III <[email protected]> wrote: > Well that's interesting. Here's what I see (but I'm not having a problem); > note several "DNS address" entries: > > netstat -qSUM DNS > MVS TCP/IP NETSTAT CS 3.1 TCPIP Name: TCPIP 15:48:25 > Storage Usage: > Maximum: 200M > Current: 25K MaxUsed: 35K > Cache Usage: > Total number of entries: 0 > Non-NX entries: 0 > A: 0 AAAA: 0 PTR: 0 > NX entries: 0 > A: 0 AAAA: 0 PTR: 0 > Queries: 497 Hits: 346 > SuccessRatio: 70% > > DNS address: 9.0.0.1 > Total number of entries: 0 > Non-NX entries: 0 > A: 0 AAAA: 0 PTR: 0 > NX entries: 0 > A: 0 AAAA: 0 PTR: 0 > References: 151 Hits: 0 > > DNS address: 208.67.222.222 > Total number of entries: 0 > Non-NX entries: 0 > A: 0 AAAA: 0 PTR: 0 > NX entries: 0 > A: 0 AAAA: 0 PTR: 0 > References: 151 Hits: 0 > > DNS address: 8.8.8.8 > Total number of entries: 0 > Non-NX entries: 0 > A: 0 AAAA: 0 PTR: 0 > NX entries: 0 > A: 0 AAAA: 0 PTR: 0 > References: 497 Hits: 346 > > -----Original Message----- > From: IBM Mainframe Discussion List <[email protected]> On Behalf > Of Mark Pace > Sent: Wednesday, June 4, 2025 4:40 PM > To: [email protected] > Subject: Re: Resolver Issue > > Not seeing anything useful there. > > > netstat -qSUM DNS > MVS TCP/IP NETSTAT CS V2R5 TCPIP Name: TCPIP 20:38:18 > Storage Usage: > Maximum: 200M > Current: 8K MaxUsed: 9K > Cache Usage: > Total number of entries: 0 > Non-NX entries: 0 > A: 0 AAAA: 0 PTR: 0 > NX entries: 0 > A: 0 AAAA: 0 PTR: 0 > Queries: 0 Hits: 0 > SuccessRatio: 0% > > > > On Wed, Jun 4, 2025 at 3:42 PM Phil Smith III < > [email protected]> wrote: > > > Looks like: > > netstat -qSUM DNS > > might also have been useful? Too late now, but maybe helpful for the > > next victim? I'm not 100% sure--went trolling to see what might be > > used since no IPCONFIG/IFCONFIG and found that. > > > > -----Original Message----- > > From: IBM Mainframe Discussion List <[email protected]> On > > Behalf Of Mark Pace > > Sent: Wednesday, June 4, 2025 3:32 PM > > To: [email protected] > > Subject: Re: Resolver Issue > > > > About 2 mins later. > > > > EZZ9310I NAME SERVER 10.6.0.10 001 > > TOTAL NUMBER OF QUERIES SENT 21 > > TOTAL NUMBER OF FAILURES 21 > > PERCENTAGE 100% > > > > On Wed, Jun 4, 2025 at 3:21 PM Mark Pace <[email protected]> wrote: > > > > > I'll give it a try and keep an eye out. > > > > > > F RESOLVER,FLUSH,ALL > > > EZZ9305I 0 CACHE ENTRIES DELETED > > > EZZ9293I FLUSH COMMAND PROCESSED > > > > > > On Wed, Jun 4, 2025 at 3:09 PM Steely.Mark < > > > [email protected]> wrote: > > > > > >> Try this: F RESOLVER,FLUSH,ALL > > >> > > >> Thanks > > >> > > >> -----Original Message----- > > >> From: IBM Mainframe Discussion List <[email protected]> On > > >> Behalf Of Mark Pace > > >> Sent: Wednesday, June 04, 2025 2:06 PM > > >> To: [email protected] > > >> Subject: Re: Resolver Issue > > >> > > >> ! > > >> > > >> CAUTION! EXTERNAL SENDER! STOP, ASSESS, AND VERIFY Do you know this > > >> person? Were you expecting this email? If not, report it using the > > >> Report Phishing Button! > > >> > > >> IPCONFIG isn't a command on z/OS, it's a configuration statement. > > >> > > >> The only thing I can be sure of is that it is the RESOLVER sending > > >> the error messages. > > >> > > >> *STC05615* 00000090 $HASP100 RESOLVER ON STCINRDR > > >> *STC05615* 00000090 EZZ9310I NAME SERVER 10.6.0.10 982 > > >> 982 00000090 TOTAL NUMBER OF QUERIES SENT 21 > > >> 982 00000090 TOTAL NUMBER OF FAILURES 21 > > >> 982 00000090 PERCENTAGE 100% > > >> > > >> > > >> *SYS1.PROCLIB(RESOLVER)* > > >> //RESOLVER PROC PARMS='CTRACE(CTIRES00)' > > >> //EZBREINI EXEC PGM=EZBREINI,REGION=0M,TIME=1440,PARM=&PARMS > > >> //SETUP DD DSN=SYS3.TCPIP.TCPPARMS(RESSETUP),DISP=SHR,FREE=CLOSE > > >> > > >> *SYS3.TCPIP.TCPPARMS(RESSETUP)* > > >> DEFAULTTCPIPDATA('SYS3.TCPIP.TCPPARMS(TCPDATA)') > > >> NOCOMMONSEARCH > > >> CACHE > > >> CACHESIZE(200M) > > >> MAXTTL(2147483647) > > >> UNRESPONSIVETHRESHOLD(25) > > >> > > >> *SYS3.TCPIP.TCPPARMS(TCPDATA)* > > >> LOOKUP LOCAL DNS > > >> NAMESERVER 8.8.8.8 8.8.4.4 > > >> NSPORTADDR 53 > > >> RESOLVEVIA UDP > > >> RESOLVERTIMEOUT 30 > > >> RESOLVERUDPRETRIES 1 > > >> > > >> On Wed, Jun 4, 2025 at 2:24 PM Phil Smith III <[email protected]> > wrote: > > >> > > >> > I don't know but I'd try ipconfig and see what it says? Easter > > >> > Egging for sure... > > >> > > > >> > -----Original Message----- > > >> > From: IBM Mainframe Discussion List <[email protected]> On > > >> > Behalf Of Mark Pace > > >> > Sent: Wednesday, June 4, 2025 1:55 PM > > >> > To: [email protected] > > >> > Subject: Resolver Issue > > >> > > > >> > I used to have a linux under VM system that was a DNS server. > > >> > My z/OS systems used this DNS server. Recently I decided to > > >> > retire that DNS server. > > >> > > > >> > I updated the TCPIP.DATA file, removed the 10.6.0.10 address and > > >> > added > > >> > 8.8.8.8 and 8.8.4.4. > > >> > SYS3.TCPIP.TCPPARMS(TCPDATA) > > >> > NAMESERVER 8.8.8.8 8.8.4.4 > > >> > > > >> > Stopped the resolver and restarted it. > > >> > And it works > > >> > > > >> > EZB3170I Server: dns.google > > >> > EZB3172I Address: 8.8.8.8 > > >> > > > >> > EZB3110I Non-authoritative answer: > > >> > EZB3170I Name: eccgw.southdata.ibm.com > > >> > EZB3172I Address: 170.225.122.67 EZB3175I Aliases: > > >> > eccgw01.boulder.ibm.com > > >> > > > >> > However - I am still receiving this error message. > > >> > > > >> > EZZ9308E UNRESPONSIVE NAME SERVER DETECTED AT IP ADDRESS > > >> > 10.6.0.10 EZZ9310I NAME SERVER 10.6.0.10 940 > > >> > TOTAL NUMBER OF QUERIES SENT 18 TOTAL > > >> NUMBER > > >> > OF FAILURES 18 PERCENTAGE > > >> > 100% > > >> > > > >> > Why would I still receive this error? > > >> > > > >> > -- > > >> > The postings on this site are my own and don’t necessarily > > >> > represent Mainline’s positions or opinions > > >> > > > >> > Mark D Pace > > >> > Senior Systems Engineer > > >> > Mainline Information Systems > > >> > > > >> > ----------------------------------------------------------------- > > >> > -- > > >> > --- For IBM-MAIN subscribe / signoff / archive access > > >> > instructions, send email to [email protected] with the > > >> > message: INFO IBM-MAIN > > >> > > > >> > ----------------------------------------------------------------- > > >> > -- > > >> > --- For IBM-MAIN subscribe / signoff / archive access > > >> > instructions, send email to [email protected] with the > > >> > message: INFO IBM-MAIN > > >> > > > >> > > >> > > >> -- > > >> The postings on this site are my own and don’t necessarily > > >> represent Mainline’s positions or opinions > > >> > > >> Mark D Pace > > >> Senior Systems Engineer > > >> Mainline Information Systems > > >> > > >> ------------------------------------------------------------------- > > >> -- > > >> - For IBM-MAIN subscribe / signoff / archive access instructions, > > >> send email to [email protected] with the message: INFO > > >> IBM-MAIN > > >> > > >> ------------------------------------------------------------------- > > >> -- > > >> - For IBM-MAIN subscribe / signoff / archive access instructions, > > >> send email to [email protected] with the message: INFO > > >> IBM-MAIN > > >> > > > > > > > > > -- > > > The postings on this site are my own and don’t necessarily represent > > > Mainline’s positions or opinions > > > > > > Mark D Pace > > > Senior Systems Engineer > > > Mainline Information Systems > > > > > > > > > > > > > > > > -- > > The postings on this site are my own and don’t necessarily represent > > Mainline’s positions or opinions > > > > Mark D Pace > > Senior Systems Engineer > > Mainline Information Systems > > > > ---------------------------------------------------------------------- > > For IBM-MAIN subscribe / signoff / archive access instructions, send > > email to [email protected] with the message: INFO IBM-MAIN > > > > ---------------------------------------------------------------------- > > For IBM-MAIN subscribe / signoff / archive access instructions, send > > email to [email protected] with the message: INFO IBM-MAIN > > > > > -- > The postings on this site are my own and don’t necessarily represent > Mainline’s positions or opinions > > Mark D Pace > Senior Systems Engineer > Mainline Information Systems > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, send email > to [email protected] with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
