I was running RedHat 6.0 with kernel 2.2.13smp and ppp 2.3.7. My ppp connections to my work and ISP were set up and working. I updated the kernel to 2.3.35smp and ppp 2.3.10. Suddenly, CHAP stopped working. I keep getting Peer is not authorized to use remote address I tried upgrading to ppp 2.3.11 but I am still having the same problems. I have not changed chap-secrets. If I go back to using 2.2.13smp and ppp 2.3.7 it works fine. I would try ppp 2.3.11 with kernel 2.2.13smp but the kernel modules changed. Here is a failed connection with debug turned on (names and IP addresses have been edited out): Jan 5 20:16:53 ppp-4-192 pppd[695]: pppd 2.3.11 started by root, uid 0 Jan 5 20:17:25 ppp-4-192 pppd[695]: Serial connection established. Jan 5 20:17:25 ppp-4-192 pppd[695]: Using interface ppp0 Jan 5 20:17:25 ppp-4-192 pppd[695]: Connect: ppp0 <--> /dev/ttyS1 Jan 5 20:17:26 ppp-4-192 pppd[695]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x9f93aadf> <pcomp> <accomp>] Jan 5 20:17:26 ppp-4-192 pppd[695]: rcvd [LCP ConfReq id=0x1 <mru 1500> <asyncmap 0xa0000> <auth 0xc027 01 00 00 03 00 00 00 0f> <magic 0x5a38dcda> <accomp> < 11 04 05 dc> < 12 02> < 13 09 03 00 80 d3 71 24 00>] Jan 5 20:17:26 ppp-4-192 pppd[695]: sent [LCP ConfRej id=0x1 < 11 04 05 dc> < 12 02> < 13 09 03 00 80 d3 71 24 00>] Jan 5 20:17:26 ppp-4-192 pppd[695]: rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x9f93aadf> <pcomp> <accomp>] Jan 5 20:17:26 ppp-4-192 pppd[695]: rcvd [LCP ConfReq id=0x2 <mru 1500> <asyncmap 0xa0000> <auth 0xc027 01 00 00 03 00 00 00 0f> <magic 0x5a38dcda> <accomp>] Jan 5 20:17:26 ppp-4-192 pppd[695]: sent [LCP ConfNak id=0x2 <auth chap MD5>] Jan 5 20:17:26 ppp-4-192 pppd[695]: rcvd [LCP ConfReq id=0x3 <mru 1500> <asyncmap 0xa0000> <auth 0xc027 01 00 00 02> <magic 0x5a38dcda> <accomp>] Jan 5 20:17:26 ppp-4-192 pppd[695]: sent [LCP ConfNak id=0x3 <auth chap MD5>] Jan 5 20:17:26 ppp-4-192 pppd[695]: rcvd [LCP ConfReq id=0x4 <mru 1500> <asyncmap 0xa0000> <auth 0xc123 01 00 00 02> <magic 0x5a38dcda> <accomp>] Jan 5 20:17:26 ppp-4-192 pppd[695]: sent [LCP ConfNak id=0x4 <auth chap MD5>] Jan 5 20:17:27 ppp-4-192 pppd[695]: rcvd [LCP ConfReq id=0x5 <mru 1500> <asyncmap 0xa0000> <auth chap MD5> <magic 0x5a38dcda> <accomp>] Jan 5 20:17:27 ppp-4-192 pppd[695]: sent [LCP ConfAck id=0x5 <mru 1500> <asyncmap 0xa0000> <auth chap MD5> <magic 0x5a38dcda> <accomp>] Jan 5 20:17:27 ppp-4-192 pppd[695]: rcvd [CHAP Challenge id=0x1 <e81ca50bfffdcfe809da6601e2d7eca6>, name = "<hidden>"] Jan 5 20:17:27 ppp-4-192 pppd[695]: sent [CHAP Response id=0x1 <6888e06e5d6bbed7feb446dfa8d7e386>, name = "<hidden>"] Jan 5 20:17:27 ppp-4-192 pppd[695]: rcvd [CHAP Success id=0x1 ""] Jan 5 20:17:27 ppp-4-192 pppd[695]: sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <compress VJ 0f 01>] Jan 5 20:17:27 ppp-4-192 pppd[695]: sent [CCP ConfReq id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>] Jan 5 20:17:27 ppp-4-192 pppd[695]: rcvd [IPCP ConfReq id=0x1 <addr <deleted>> <compress VJ 0f 00>] Jan 5 20:17:27 ppp-4-192 pppd[695]: sent [IPCP ConfAck id=0x1 <addr <deleted>> <compress VJ 0f 00>] Jan 5 20:17:27 ppp-4-192 pppd[695]: rcvd [LCP ProtRej id=0x40 80 fd 01 01 00 0f 1a 04 78 00 18 04 78 00 15 03 2f] Jan 5 20:17:28 ppp-4-192 pppd[695]: rcvd [IPCP ConfNak id=0x1 <addr <deleted>>] Jan 5 20:17:28 ppp-4-192 pppd[695]: sent [IPCP ConfReq id=0x2 <addr <deleted>> <compress VJ 0f 01>] Jan 5 20:17:28 ppp-4-192 pppd[695]: rcvd [IPCP ConfAck id=0x2 <addr <deleted>> <compress VJ 0f 01>] Jan 5 20:17:28 ppp-4-192 pppd[695]: Peer is not authorized to use remote address <deleted> Jan 5 20:17:28 ppp-4-192 pppd[695]: sent [IPCP TermReq id=0x3 "Unauthorized remote IP address"] Jan 5 20:17:28 ppp-4-192 pppd[695]: rcvd [IPCP TermAck id=0x3] Jan 5 20:17:28 ppp-4-192 pppd[695]: sent [LCP TermReq id=0x2 "No network protocols running"] Jan 5 20:17:28 ppp-4-192 pppd[695]: rcvd [LCP TermAck id=0x2] Jan 5 20:17:28 ppp-4-192 pppd[695]: Connection terminated. Jan 5 20:17:28 ppp-4-192 pppd[695]: Connect time 0.1 minutes. Jan 5 20:17:28 ppp-4-192 pppd[695]: Sent 184 bytes, received 291 bytes. Jan 5 20:17:28 ppp-4-192 pppd[695]: Hangup (SIGHUP) Jan 5 20:17:28 ppp-4-192 pppd[695]: Exit. This is a successful connection using kernel 2.2.13smp and ppp 2.3.7 Jan 5 20:22:25 ppp-4-192 pppd[628]: pppd 2.3.7 started by root, uid 0 Jan 5 20:22:57 ppp-4-192 pppd[628]: Serial connection established. Jan 5 20:22:57 ppp-4-192 pppd[628]: Using interface ppp0 Jan 5 20:22:57 ppp-4-192 pppd[628]: Connect: ppp0 <--> /dev/ttyS1 Jan 5 20:22:58 ppp-4-192 pppd[628]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xb1901d9c> <pcomp> <accomp>] Jan 5 20:22:58 ppp-4-192 pppd[628]: rcvd [LCP ConfReq id=0x1 <mru 1500> <asyncmap 0xa0000> <auth 0xc027 01 00 00 03 00 00 00 0f> <magic 0x14ac45bf> <accomp> < 11 04 05 dc> < 12 02> < 13 09 03 00 80 d3 71 24 00>] Jan 5 20:22:58 ppp-4-192 pppd[628]: sent [LCP ConfRej id=0x1 < 11 04 05 dc> < 12 02> < 13 09 03 00 80 d3 71 24 00>] Jan 5 20:22:58 ppp-4-192 pppd[628]: rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0xb1901d9c> <pcomp> <accomp>] Jan 5 20:22:58 ppp-4-192 pppd[628]: rcvd [LCP ConfReq id=0x2 <mru 1500> <asyncmap 0xa0000> <auth 0xc027 01 00 00 03 00 00 00 0f> <magic 0x14ac45bf> <accomp>] Jan 5 20:22:58 ppp-4-192 pppd[628]: sent [LCP ConfNak id=0x2 <auth chap MD5>] Jan 5 20:22:58 ppp-4-192 pppd[628]: rcvd [LCP ConfReq id=0x3 <mru 1500> <asyncmap 0xa0000> <auth 0xc027 01 00 00 02> <magic 0x14ac45bf> <accomp>] Jan 5 20:22:58 ppp-4-192 pppd[628]: sent [LCP ConfNak id=0x3 <auth chap MD5>] Jan 5 20:22:58 ppp-4-192 pppd[628]: rcvd [LCP ConfReq id=0x4 <mru 1500> <asyncmap 0xa0000> <auth 0xc123 01 00 00 02> <magic 0x14ac45bf> <accomp>] Jan 5 20:22:58 ppp-4-192 pppd[628]: sent [LCP ConfNak id=0x4 <auth chap MD5>] Jan 5 20:22:59 ppp-4-192 pppd[628]: rcvd [LCP ConfReq id=0x5 <mru 1500> <asyncmap 0xa0000> <auth chap MD5> <magic 0x14ac45bf> <accomp>] Jan 5 20:22:59 ppp-4-192 pppd[628]: sent [LCP ConfAck id=0x5 <mru 1500> <asyncmap 0xa0000> <auth chap MD5> <magic 0x14ac45bf> <accomp>] Jan 5 20:22:59 ppp-4-192 pppd[628]: rcvd [CHAP Challenge id=0x1 <bb54148cd15797d5564cbbeae0e97edb>, name = "<deleted>"] Jan 5 20:22:59 ppp-4-192 pppd[628]: sent [CHAP Response id=0x1 <38a368400f76ae2e8dd5631b229e5ff6>, name = "<deleted>"] Jan 5 20:22:59 ppp-4-192 pppd[628]: rcvd [CHAP Success id=0x1 ""] Jan 5 20:22:59 ppp-4-192 pppd[628]: sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <compress VJ 0f 01>] Jan 5 20:22:59 ppp-4-192 pppd[628]: sent [CCP ConfReq id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>] Jan 5 20:22:59 ppp-4-192 pppd[628]: rcvd [IPCP ConfReq id=0x1 <addr <deleted>> <compress VJ 0f 00>] Jan 5 20:22:59 ppp-4-192 pppd[628]: sent [IPCP ConfAck id=0x1 <addr <deleted>> <compress VJ 0f 00>] Jan 5 20:22:59 ppp-4-192 pppd[628]: rcvd [LCP ProtRej id=0x40 80 fd 01 01 00 0f 1a 04 78 00 18 04 78 00 15 03 2f] Jan 5 20:22:59 ppp-4-192 pppd[628]: rcvd [IPCP ConfNak id=0x1 <addr <deleted>>] Jan 5 20:22:59 ppp-4-192 pppd[628]: sent [IPCP ConfReq id=0x2 <addr <deleted>> <compress VJ 0f 01>] Jan 5 20:23:00 ppp-4-192 pppd[628]: rcvd [IPCP ConfAck id=0x2 <addr <deleted>> <compress VJ 0f 01>] Jan 5 20:23:00 ppp-4-192 pppd[628]: local IP address <deleted> Jan 5 20:23:00 ppp-4-192 pppd[628]: remote IP address <deleted> Jan 5 20:23:00 ppp-4-192 pppd[628]: Script /etc/ppp/ip-up started; pid = 661 -- Eric M. 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