Hello list, I'm running RHEL 3 with xdmcp enabled for remote X11 using gdm. We have cygwin running on windows PC's connecting to the Linux machine. My problem is that cygwin was failing to connect to the Linux box when the second Linux NIC (NIC1) was up. After trawling the logs I found the initial part of the handshaking for a failed gdm connect went like this: Dec 16 10:55:03 compileserver gdm[2916]: gdm_xdmcp_decode: Received opcode QUERY from client 192.168.0.5 Dec 16 10:55:03 compileserver gdm[2916]: gdm_xdmcp_send_willing: Sending WILLING to 192.168.0.5 Dec 16 10:55:04 compileserver gdm[2916]: gdm_xdmcp_decode: Received opcode REQUEST from client 192.168.0.5 Dec 16 10:55:14 compileserver gdm[2916]: gdm_auth_secure_display: Setting up access for 192.168.0.5:0 - 1 entries ... Where as a successful connect with Nic1 lo went like this: Dec 16 10:55:03 compileserver gdm[2916]: gdm_xdmcp_decode: Received opcode QUERY from client 192.168.0.5 Dec 16 10:55:03 compileserver gdm[2916]: gdm_xdmcp_send_willing: Sending WILLING to 192.168.0.5 Dec 16 10:55:04 compileserver gdm[2916]: gdm_xdmcp_decode: Received opcode REQUEST from client 192.168.0.5 Dec 16 10:55:14 compileserver gdm[2916]: gdm_auth_secure_display: Setting up access w2kantonyja.devnet.com:0 - 1 entries ... Ahh I thought, so gdm_auth_secure_display is failing to resolve 192.168.0.5 to w2kantonyja.devnet.com. NIC1 was using DHCP and peerdns was set to true. After inspecting the resolv.conf I found the nameserver was being issued erroneously therefore no gethostbyname. Great. I have no control over the router issuing the dns server via a client dhcp request, so I've temporarily assigned Nic1 a static IP and turned off peerdns, then manually adjusted /etc/resolv.conf to point at the nameserver running locally. Now I can do a host 192.168.0.5 which correctly returns w2kantonyja.devnet.com. I thought this would suffice, but no, still can't use cygwin with Nic1 up. So in shear desperation I've added the host names to /etc/hosts and it all works perfectly. My question is what's wrong with my reverse dns lookup if host xxx.xxx.xxx.xxx returns a hostname locally, why does gdm still fail to correctly resolve IP -> Hostname for the gdm auth ? TIA Andrew. ***LEGAL DISCLAIMER: READ THIS FIRST*** This Email and any files transmitted with it are confidential and intended solely for the use of the individual to whom or the entity to which they are addressed. If you have received this email in error please notify the sender immediately. Please note that any views or opinions presented in this email are those of the author and do not necessarily represent those of Allen & Heath Limited. This email has been checked for the presence of viruses using Sophos AV Scanner. Anti-virus updates are downloaded on a daily basis . The recipient should also check this email and any attachments for the presence of viruses. Allen & Heath Limited accepts no liability for any damage caused by any virus transmitted via this email. *** -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subjecthttps://www.redhat.com/mailman/listinfo/redhat-list
