I cannot figure out why this is happening - I had to rebuild my VM and this is what happens.

When I want to print to my OpenSUSE host printer from my VirtualBox OpenSUSE guest the printer disappears from the list of printers.

for some reason LLR1 (the ip 101) shows as ipv6 rather than ipv4 so I added an ipv6 to the host and guest - no difference.

Thank you in advance for you answers. (I have deleted and added the printer on the host with no change.)

lpinfo -v and lpstat -l -e shows it but it is not in the printer selection - but if I systemctl restart cups on the server - the printer magically appears.

VM1:/etc/cups/ssl # lpinfo -v
network beh
direct pipe
network ipps
network beh.pl
network http
direct hp
network lpd
network https
network ipp
network socket
network smb
network dnssd://Brother%20HL-L2395DW%20series%20%40%20LLR1._ipp._tcp.local/cups?uuid=00a9525c-6526-378f-4b5c-82a916318503
network dnssd://EPSON%20ET-2720%20Series%20%40%20rmr._ipp._tcp.local/cups?uuid=7215b299-8916-3513-4681-5800f700a884

VM1:/etc/cups/ssl # lpstat -l -e
Brother_HL_L2395DW_series_LLR1 network none ipps://Brother%20HL-L2395DW%20series%20%40%20LLR1._ipps._tcp.local/cups
EPSON_ET_2720_Series_rmr network none ipps://EPSON%20ET-2720%20Series%20%40%20rmr._ipps._tcp.local/cups
VM1:/etc/cups/ssl #

I see lots of CLOSE_WAIT to CUPS on the 2 servers 112 is my wife's server and 101 is my server

VM1:/etc/cups/ssl # netstat -an | grep 631
tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN     
tcp        1      0 192.168.20.241:55170    192.168.20.112:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:51496    192.168.20.112:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:35462    192.168.20.112:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:52286    192.168.20.112:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:51480    192.168.20.112:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:36570    192.168.20.101:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:54808    192.168.20.101:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:47350    192.168.20.112:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:41482    192.168.20.112:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:35460    192.168.20.112:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:41490    192.168.20.112:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:39168    192.168.20.112:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:48904    192.168.20.101:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:43180    192.168.20.101:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:47002    192.168.20.112:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:36576    192.168.20.101:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:47342    192.168.20.112:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:46998    192.168.20.112:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:54822    192.168.20.101:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:55324    192.168.20.112:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:47316    192.168.20.101:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:51862    192.168.20.101:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:48894    192.168.20.101:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:58130    192.168.20.112:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:52272    192.168.20.112:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:56412    192.168.20.101:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:58136    192.168.20.112:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:55164    192.168.20.112:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:51848    192.168.20.101:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:35434    192.168.20.112:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:55318    192.168.20.112:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:56398    192.168.20.101:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:39156    192.168.20.112:631      CLOSE_WAIT
tcp        1      0 192.168.20.241:43172    192.168.20.101:631      CLOSE_WAIT
unix  3      [ ]         STREAM     CONNECTED     28631  

Output of  avahi-browse -art

VM1:/etc/cups/ssl # avahi-browse -art
+   eth0 IPv6 Brother HL-L2395DW series @ LLR1              Secure Internet Printer local
+   eth0 IPv6 EPSON ET-2720 Series @ rmr                    Secure Internet Printer local
+   eth0 IPv4 Brother HL-L2395DW series @ LLR1              Secure Internet Printer local
+   eth0 IPv4 EPSON ET-2720 Series @ rmr                    Secure Internet Printer local
+   eth0 IPv6 Brother HL-L2395DW series @ LLR1              Internet Printer     local
+   eth0 IPv6 EPSON ET-2720 Series @ rmr                    Internet Printer     local
+   eth0 IPv4 Brother HL-L2395DW series @ LLR1              Internet Printer     local
+   eth0 IPv4 EPSON ET-2720 Series @ rmr                    Internet Printer     local
+   eth0 IPv6 EPSON ET-2720 Series @ rmr                    UNIX Printer         local
+   eth0 IPv6 Brother HL-L2395DW series @ LLR1              UNIX Printer         local
+   eth0 IPv4 EPSON ET-2720 Series @ rmr                    UNIX Printer         local
+   eth0 IPv4 Brother HL-L2395DW series @ LLR1              UNIX Printer         local
=   eth0 IPv6 EPSON ET-2720 Series @ rmr                    Secure Internet Printer local
   hostname = [rmr.local]
   address = [fe80::56bf:64ff:fea1:d891]
   port = [631]
   txt = ["printer-type=0x100E" "printer-state=3" "Color=T" "TLS=1.2" "UUID=7215b299-8916-3513-4681-5800f700a884" "pdl=application/octet-stream,application/pdf,application/postscript,image/jpeg,image/png,image/pwg-raster" "product=(EPSON ET-2720 Series)" "priority=0" "note=Rose's PC" "adminurl=https://rmr.local.:631/printers/EPSON_ET-2720_Series" "ty=Epson ET-2720 Series - epson-inkjet-printer-escpr 1.7.7-1lsb3.2 (Seiko Epson Corporation LSB 3.2)" "rp=printers/EPSON_ET-2720_Series" "qtotal=1" "txtvers=1"]
=   eth0 IPv6 EPSON ET-2720 Series @ rmr                    UNIX Printer         local
   hostname = [rmr.local]
   address = [fe80::56bf:64ff:fea1:d891]
   port = [0]
   txt = []
=   eth0 IPv6 EPSON ET-2720 Series @ rmr                    Internet Printer     local
   hostname = [rmr.local]
   address = [fe80::56bf:64ff:fea1:d891]
   port = [631]
   txt = ["printer-type=0x100E" "printer-state=3" "Color=T" "TLS=1.2" "UUID=7215b299-8916-3513-4681-5800f700a884" "pdl=application/octet-stream,application/pdf,application/postscript,image/jpeg,image/png,image/pwg-raster" "product=(EPSON ET-2720 Series)" "priority=0" "note=Rose's PC" "adminurl=https://rmr.local.:631/printers/EPSON_ET-2720_Series" "ty=Epson ET-2720 Series - epson-inkjet-printer-escpr 1.7.7-1lsb3.2 (Seiko Epson Corporation LSB 3.2)" "rp=printers/EPSON_ET-2720_Series" "qtotal=1" "txtvers=1"]
=   eth0 IPv4 EPSON ET-2720 Series @ rmr                    Secure Internet Printer local
   hostname = [rmr.local]
   address = [192.168.20.112]
   port = [631]
   txt = ["printer-type=0x100E" "printer-state=3" "Color=T" "TLS=1.2" "UUID=7215b299-8916-3513-4681-5800f700a884" "pdl=application/octet-stream,application/pdf,application/postscript,image/jpeg,image/png,image/pwg-raster" "product=(EPSON ET-2720 Series)" "priority=0" "note=Rose's PC" "adminurl=https://rmr.local.:631/printers/EPSON_ET-2720_Series" "ty=Epson ET-2720 Series - epson-inkjet-printer-escpr 1.7.7-1lsb3.2 (Seiko Epson Corporation LSB 3.2)" "rp=printers/EPSON_ET-2720_Series" "qtotal=1" "txtvers=1"]
=   eth0 IPv4 EPSON ET-2720 Series @ rmr                    UNIX Printer         local
   hostname = [rmr.local]
   address = [192.168.20.112]
   port = [0]
   txt = []
=   eth0 IPv4 EPSON ET-2720 Series @ rmr                    Internet Printer     local
   hostname = [rmr.local]
   address = [192.168.20.112]
   port = [631]
   txt = ["printer-type=0x100E" "printer-state=3" "Color=T" "TLS=1.2" "UUID=7215b299-8916-3513-4681-5800f700a884" "pdl=application/octet-stream,application/pdf,application/postscript,image/jpeg,image/png,image/pwg-raster" "product=(EPSON ET-2720 Series)" "priority=0" "note=Rose's PC" "adminurl=https://rmr.local.:631/printers/EPSON_ET-2720_Series" "ty=Epson ET-2720 Series - epson-inkjet-printer-escpr 1.7.7-1lsb3.2 (Seiko Epson Corporation LSB 3.2)" "rp=printers/EPSON_ET-2720_Series" "qtotal=1" "txtvers=1"]
=   eth0 IPv6 Brother HL-L2395DW series @ LLR1              Secure Internet Printer local
   hostname = [LLR1.local]
   address = [fe80::988e:e1eb:2ce8:c09e]
   port = [631]
   txt = ["printer-type=0x809016" "printer-state=3" "Duplex=T" "TLS=1.2" "UUID=00a9525c-6526-378f-4b5c-82a916318503" "pdl=application/octet-stream,application/pdf,application/postscript,image/jpeg,image/png,image/pwg-raster" "product=(Brother HLL2395DW series)" "priority=0" "note=LLR1" "adminurl=https://LLR1.local.:631/printers/Brother_HL-L2395DW_series" "ty=Brother HLL2395DW for CUPS" "rp=printers/Brother_HL-L2395DW_series" "qtotal=1" "txtvers=1"]
=   eth0 IPv6 Brother HL-L2395DW series @ LLR1              UNIX Printer         local
   hostname = [LLR1.local]
   address = [fe80::988e:e1eb:2ce8:c09e]
   port = [0]
   txt = []
=   eth0 IPv6 Brother HL-L2395DW series @ LLR1              Internet Printer     local
   hostname = [LLR1.local]
   address = [fe80::988e:e1eb:2ce8:c09e]
   port = [631]
   txt = ["printer-type=0x809016" "printer-state=3" "Duplex=T" "TLS=1.2" "UUID=00a9525c-6526-378f-4b5c-82a916318503" "pdl=application/octet-stream,application/pdf,application/postscript,image/jpeg,image/png,image/pwg-raster" "product=(Brother HLL2395DW series)" "priority=0" "note=LLR1" "adminurl=https://LLR1.local.:631/printers/Brother_HL-L2395DW_series" "ty=Brother HLL2395DW for CUPS" "rp=printers/Brother_HL-L2395DW_series" "qtotal=1" "txtvers=1"]
+   eth0 IPv6 LLR1                                          Microsoft Windows Network local
+   eth0 IPv6 LLR1                                          Device Info          local
=   eth0 IPv6 LLR1                                          Microsoft Windows Network local
   hostname = [LLR1.local]
   address = [fe80::988e:e1eb:2ce8:c09e]
   port = [445]
   txt = []
=   eth0 IPv6 LLR1                                          Device Info          local
   hostname = [LLR1.local]
   address = [fe80::988e:e1eb:2ce8:c09e]
   port = [0]
   txt = ["model=MacSamba"]
+   eth0 IPv4 myrouter                                      Web Site             local
=   eth0 IPv4 myrouter                                      Web Site             local
   hostname = [myrouter.local]
   address = [192.168.20.1]
   port = [80]
   txt = []
+   eth0 IPv4 60fd42c5-5a35-5053-8c50-8003e530672c          _spotify-connect._tcp local
+   eth0 IPv4 Roku Streaming Stick                          AirPlay Remote Video local
=   eth0 IPv4 60fd42c5-5a35-5053-8c50-8003e530672c          _spotify-connect._tcp local
   hostname = [YH007T481660.local]
   address = [192.168.20.205]
   port = [35157]
   txt = ["CPath=/zc"]
=   eth0 IPv4 Roku Streaming Stick                          AirPlay Remote Video local
   hostname = [YH007T481660.local]
   address = [192.168.20.205]
   port = [7000]
   txt = ["pk=8e09f2acdfbd5fdab0fbadd8019fde9ccece96e34166c4ccd2b3fa739ac1f085" "gcgl=0" "gid=00000000-0000-0000-0000-EC453E924ADA" "psi=00000000-0000-0000-0000-EC453E924ADA" "pi=EC:45:3E:92:4A:DA" "srcvers=377.40.00" "protovers=1.1" "serialNumber=4f0ef23a-8eee-5c3d-8c36-0d35616d2e50" "manufacturer=Roku" "integrator=Roku" "model=3810RW" "flags=0x244" "at=0x3" "fv=p20.12.00.4184" "rsf=0x3" "fex=0Ip/AEbPCwFA" "features=0x7F8AD0,0x10BCF46" "deviceid=EC:45:3E:92:4A:DA" "acl=0"]
+   eth0 IPv4 e583fd42-f4b2-56de-ad31-384894d41efc          _spotify-connect._tcp local
+   eth0 IPv4 Roku Streaming Stick (4)                      AirPlay Remote Video local
=   eth0 IPv4 e583fd42-f4b2-56de-ad31-384894d41efc          _spotify-connect._tcp local
   hostname = [YH001G532174.local]
   address = [192.168.20.209]
   port = [46670]
   txt = ["CPath=/zc"]
=   eth0 IPv4 Roku Streaming Stick (4)                      AirPlay Remote Video local
   hostname = [YH001G532174.local]
   address = [192.168.20.209]
   port = [7000]
   txt = ["pk=bbf9cbbc2d7948f293e334ba1ff3a2f9218caae56dd99d09ea1deb1469e9b467" "gcgl=0" "gid=00000000-0000-0000-0000-38A33DD07052" "psi=00000000-0000-0000-0000-38A33DD07052" "pi=38:A3:3D:D0:70:52" "srcvers=377.40.00" "protovers=1.1" "serialNumber=6ab55113-2935-545d-9e61-1b4a78572151" "manufacturer=Roku" "integrator=Roku" "model=3810RW" "flags=0x244" "at=0x3" "fv=p20.12.00.4184" "rsf=0x3" "fex=0Ip/AEbPCwFA" "features=0x7F8AD0,0x10BCF46" "deviceid=38:A3:3D:D0:70:52" "acl=0"]
+   eth0 IPv4 496867ce-e15e-5808-bd01-7fca386a8ebc          _spotify-connect._tcp local
+   eth0 IPv4 Roku Streaming Stick (3)                      AirPlay Remote Video local
=   eth0 IPv4 496867ce-e15e-5808-bd01-7fca386a8ebc          _spotify-connect._tcp local
   hostname = [YH003Y824367.local]
   address = [192.168.20.238]
   port = [50236]
   txt = ["CPath=/zc"]
=   eth0 IPv4 Roku Streaming Stick (3)                      AirPlay Remote Video local
   hostname = [YH003Y824367.local]
   address = [192.168.20.238]
   port = [7000]
   txt = ["pk=06a2706431daca4fbff169a13ecfe21265c03951e32a9930d5203bc139c37601" "gcgl=0" "gid=00000000-0000-0000-0000-D2011E0713F6" "psi=00000000-0000-0000-0000-D2011E0713F6" "pi=D2:01:1E:07:13:F6" "srcvers=377.40.00" "protovers=1.1" "serialNumber=02f141ef-fb96-5983-bfbe-597104c40189" "manufacturer=Roku" "integrator=Roku" "model=3810RW" "flags=0x244" "at=0x3" "fv=p20.12.00.4184" "rsf=0x3" "fex=0Ip/AEbPCwFA" "features=0x7F8AD0,0x10BCF46" "deviceid=D2:01:1E:07:13:F6" "acl=0"]
+   eth0 IPv4 bc790148-cfcd-589c-941c-596993f0aa3e          _spotify-connect._tcp local
+   eth0 IPv4 Roku Streaming Stick (2)                      AirPlay Remote Video local
=   eth0 IPv4 bc790148-cfcd-589c-941c-596993f0aa3e          _spotify-connect._tcp local
   hostname = [YH004W649434.local]
   address = [192.168.20.222]
   port = [50578]
   txt = ["CPath=/zc"]
=   eth0 IPv4 Roku Streaming Stick (2)                      AirPlay Remote Video local
   hostname = [YH004W649434.local]
   address = [192.168.20.222]
   port = [7000]
   txt = ["pk=0dcceaef7b9598a5410de041b2e929954bcbcb6df797e8f3d08884634bab4dd3" "gcgl=0" "gid=00000000-0000-0000-0000-9BF7C8A3AE1F" "psi=00000000-0000-0000-0000-9BF7C8A3AE1F" "pi=9B:F7:C8:A3:AE:1F" "srcvers=377.40.00" "protovers=1.1" "serialNumber=121764fc-7b17-51e1-a556-5f40d4ffb0aa" "manufacturer=Roku" "integrator=Roku" "model=3810RW" "flags=0x244" "at=0x3" "fv=p20.12.00.4184" "rsf=0x3" "fex=0Ip/AEbPCwFA" "features=0x7F8AD0,0x10BCF46" "deviceid=9B:F7:C8:A3:AE:1F" "acl=0"]
Failed to resolve service 'Brother HL-L2395DW series @ LLR1' of type '_ipps._tcp' in domain 'local': Timeout reached
Failed to resolve service 'Brother HL-L2395DW series @ LLR1' of type '_ipp._tcp' in domain 'local': Timeout reached
Failed to resolve service 'Brother HL-L2395DW series @ LLR1' of type '_printer._tcp' in domain 'local': Timeout reached
VM1:/etc/cups/ssl #