Windows Server 2003 is an ISA 2006 SP1 server connecting from the IP 184.71.24.198.

PPTPd server is a CentOS server at 96.126.97.134.

PPTPd server is 10.1.0.1 (on the VPN), attempting to assign server dialling in 10.1.0.2.

Trying to initiate the connection from the Windows Server 2003 box:

"A connection to the remote computer could not be established."

Event Viewer reports Event ID 20111:

"A Demand Dial connection to the remote interface Fremont on port VPN4-93 was successfully initiated but failed to complete successfully because of the following error: A connection to the remote computer could not be established. You might need to change the network settings for this connection."

The Windows Server 2003 RRAS server operates correctly when it itself is dialled into by the built in Windows PPTP client.

From /var/log/messages:

Code:
Feb 21 12:35:47 li330-134 pptpd[28298]: CTRL: Client 184.71.24.198 control connection started
Feb 21 12:35:47 li330-134 pptpd[28298]: CTRL: Starting call (launching pppd, opening GRE)
Feb 21 12:35:47 li330-134 pppd[28299]: Plugin /usr/lib64/pptpd/pptpd-logwtmp.so loaded.
Feb 21 12:35:47 li330-134 pppd[28299]: pptpd-logwtmp: $Version$
Feb 21 12:35:47 li330-134 pppd[28299]: pppd options in effect:
Feb 21 12:35:47 li330-134 pppd[28299]: debug#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:35:47 li330-134 pppd[28299]: nologfd#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:35:47 li330-134 pppd[28299]: dump#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:35:47 li330-134 pppd[28299]: plugin /usr/lib64/pptpd/pptpd-logwtmp.so#011#011# (from command line)
Feb 21 12:35:47 li330-134 pppd[28299]: require-mschap-v2#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:35:47 li330-134 pppd[28299]: refuse-pap#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:35:47 li330-134 pppd[28299]: refuse-chap#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:35:47 li330-134 pppd[28299]: refuse-mschap#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:35:47 li330-134 pppd[28299]: name pptpd#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:35:47 li330-134 pppd[28299]: pptpd-original-ip 184.71.24.198#011#011# (from command line)
Feb 21 12:35:47 li330-134 pppd[28299]: 115200#011#011# (from command line)
Feb 21 12:35:47 li330-134 pppd[28299]: lock#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:35:47 li330-134 pppd[28299]: local#011#011# (from command line)
Feb 21 12:35:47 li330-134 pppd[28299]: novj#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:35:47 li330-134 pppd[28299]: novjccomp#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:35:47 li330-134 pppd[28299]: ipparam 184.71.24.198#011#011# (from command line)
Feb 21 12:35:47 li330-134 pppd[28299]: noipdefault#011#011# (from /etc/ppp/options)
Feb 21 12:35:47 li330-134 pppd[28299]: ms-dns xxx # [don't know how to print value]#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:35:47 li330-134 pppd[28299]: 10.1.0.1:10.1.0.2#011#011# (from command line)
Feb 21 12:35:47 li330-134 pppd[28299]: nobsdcomp#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:35:47 li330-134 pppd[28299]: require-mppe-128#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:35:47 li330-134 pppd[28299]: pppd 2.4.5 started by root, uid 0
Feb 21 12:35:47 li330-134 pppd[28299]: Using interface ppp0
Feb 21 12:35:47 li330-134 pppd[28299]: Connect: ppp0 <--> /dev/pts/1
Feb 21 12:35:47 li330-134 pptpd[28298]: CTRL: Ignored a SET LINK INFO packet with real ACCMs!
Feb 21 12:35:47 li330-134 pppd[28299]: MPPE 128-bit stateless compression enabled
Feb 21 12:35:49 li330-134 pppd[28299]: local  IP address 10.1.0.1
Feb 21 12:35:49 li330-134 pppd[28299]: remote IP address 10.1.0.2
Feb 21 12:35:49 li330-134 pppd[28299]: pptpd-logwtmp.so ip-up ppp0 leahyhome 184.71.24.198
Feb 21 12:35:49 li330-134 pppd[28299]: IPCP terminated by peer (HM-YFM-`^AT_SIGN<M-Mt^AT_SIGN^AT_SIGN^AT_SIGN^_)
Feb 21 12:35:49 li330-134 pppd[28299]: pptpd-logwtmp.so ip-down ppp0
Feb 21 12:35:49 li330-134 pppd[28299]: Connect time 0.0 minutes.
Feb 21 12:35:49 li330-134 pppd[28299]: Sent 0 bytes, received 16 bytes.
Feb 21 12:35:49 li330-134 pppd[28299]: LCP terminated by peer (HM-YFM-`^AT_SIGN<M-Mt^AT_SIGN^AT_SIGN^AT_SIGN^AT_SIGN)
Feb 21 12:35:49 li330-134 pppd[28299]: Modem hangup
Feb 21 12:35:49 li330-134 pppd[28299]: Connection terminated.
Feb 21 12:35:49 li330-134 pppd[28299]: Connect time 0.0 minutes.
Feb 21 12:35:49 li330-134 pppd[28299]: Sent 4 bytes, received 16 bytes.
Feb 21 12:35:49 li330-134 pppd[28299]: Exit.
Feb 21 12:35:49 li330-134 pptpd[28298]: CTRL: Client 184.71.24.198 control connection finished
Frome /var/log/debug (with "debug dump" specified):

Code:
Feb 21 12:21:43 li330-134 pptpd[28146]: CTRL: Client 184.71.24.198 control connection started
Feb 21 12:21:43 li330-134 pptpd[28146]: CTRL: Starting call (launching pppd, opening GRE)
Feb 21 12:21:43 li330-134 pppd[28147]: Plugin /usr/lib64/pptpd/pptpd-logwtmp.so loaded.
Feb 21 12:21:43 li330-134 pppd[28147]: pptpd-logwtmp: $Version$
Feb 21 12:21:43 li330-134 pppd[28147]: pppd options in effect:
Feb 21 12:21:43 li330-134 pppd[28147]: debug#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:21:43 li330-134 pppd[28147]: nologfd#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:21:43 li330-134 pppd[28147]: dump#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:21:43 li330-134 pppd[28147]: plugin /usr/lib64/pptpd/pptpd-logwtmp.so#011#011# (from command line)
Feb 21 12:21:43 li330-134 pppd[28147]: require-mschap-v2#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:21:43 li330-134 pppd[28147]: refuse-pap#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:21:43 li330-134 pppd[28147]: refuse-chap#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:21:43 li330-134 pppd[28147]: refuse-mschap#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:21:43 li330-134 pppd[28147]: name pptpd#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:21:43 li330-134 pppd[28147]: pptpd-original-ip 184.71.24.198#011#011# (from command line)
Feb 21 12:21:43 li330-134 pppd[28147]: 115200#011#011# (from command line)
Feb 21 12:21:43 li330-134 pppd[28147]: lock#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:21:43 li330-134 pppd[28147]: local#011#011# (from command line)
Feb 21 12:21:43 li330-134 pppd[28147]: novj#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:21:43 li330-134 pppd[28147]: novjccomp#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:21:43 li330-134 pppd[28147]: ipparam 184.71.24.198#011#011# (from command line)
Feb 21 12:21:43 li330-134 pppd[28147]: noipdefault#011#011# (from /etc/ppp/options)
Feb 21 12:21:43 li330-134 pppd[28147]: ms-dns xxx # [don't know how to print value]#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:21:43 li330-134 pppd[28147]: 10.1.0.1:10.1.0.2#011#011# (from command line)
Feb 21 12:21:43 li330-134 pppd[28147]: nobsdcomp#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:21:43 li330-134 pppd[28147]: require-mppe-128#011#011# (from /etc/ppp/options.pptpd)
Feb 21 12:21:43 li330-134 pppd[28147]: pppd 2.4.5 started by root, uid 0
Feb 21 12:21:43 li330-134 pppd[28147]: using channel 664
Feb 21 12:21:43 li330-134 pppd[28147]: Using interface ppp0
Feb 21 12:21:43 li330-134 pppd[28147]: Connect: ppp0 <--> /dev/pts/1
Feb 21 12:21:43 li330-134 pppd[28147]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <auth chap MS-v2> <magic 0x43294961> <pcomp> <accomp>]
Feb 21 12:21:43 li330-134 pppd[28147]: rcvd [LCP ConfReq id=0x0 <mru 1400> <magic 0x3aa54e91> <pcomp> <accomp> <callback CBCP> <mrru 1614> <endpoint [local:50.d6.98.d9.dd.4a.46.cb.80.d5.b6.aa.70.7b.32.6a.00.00.00.fe]>]
Feb 21 12:21:43 li330-134 pppd[28147]: sent [LCP ConfRej id=0x0 <callback CBCP> <mrru 1614>]
Feb 21 12:21:43 li330-134 pppd[28147]: rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <auth chap MS-v2> <magic 0x43294961> <pcomp> <accomp>]
Feb 21 12:21:43 li330-134 pppd[28147]: rcvd [LCP ConfReq id=0x1 <mru 1400> <magic 0x3aa54e91> <pcomp> <accomp> <endpoint [local:50.d6.98.d9.dd.4a.46.cb.80.d5.b6.aa.70.7b.32.6a.00.00.00.fe]>]
Feb 21 12:21:43 li330-134 pppd[28147]: sent [LCP ConfAck id=0x1 <mru 1400> <magic 0x3aa54e91> <pcomp> <accomp> <endpoint [local:50.d6.98.d9.dd.4a.46.cb.80.d5.b6.aa.70.7b.32.6a.00.00.00.fe]>]
Feb 21 12:21:43 li330-134 pppd[28147]: sent [CHAP Challenge id=0xbc <3e56962214e0b330b30aeb76903eab83>, name = "pptpd"]
Feb 21 12:21:43 li330-134 pppd[28147]: rcvd [LCP Ident id=0x2 magic=0x3aa54e91 "MSRASV5.20"]
Feb 21 12:21:43 li330-134 pppd[28147]: rcvd [LCP Ident id=0x3 magic=0x3aa54e91 "MSRAS-0-LEAHYISA1"]
Feb 21 12:21:43 li330-134 pppd[28147]: rcvd [CHAP Response id=0xbc <7db8bb3ab377724b64ac8932066e067300000000000000002689993b91f11e10d3981ec14b13e3dc084529cf875a943900>, name = "leahyhome"]
Feb 21 12:21:43 li330-134 pppd[28147]: sent [CHAP Success id=0xbc "S=C1EED5AE4D0CC968701906CC1060B813EE5D65C5 M=Access granted"]
Feb 21 12:21:43 li330-134 pppd[28147]: Script /etc/ppp/auth-up started (pid 28152)
Feb 21 12:21:43 li330-134 pppd[28147]: sent [CCP ConfReq id=0x1 <mppe +H -M +S -L -D -C>]
Feb 21 12:21:43 li330-134 pptpd[28146]: CTRL: Ignored a SET LINK INFO packet with real ACCMs!
Feb 21 12:21:43 li330-134 pppd[28147]: Script /etc/ppp/auth-up finished (pid 28152), status = 0x0
Feb 21 12:21:43 li330-134 pppd[28147]: rcvd [CCP ConfReq id=0x4 <mppe +H +M +S +L -D +C>]
Feb 21 12:21:43 li330-134 pppd[28147]: sent [CCP ConfNak id=0x4 <mppe +H -M +S -L -D -C>]
Feb 21 12:21:43 li330-134 pppd[28147]: rcvd [IPCP ConfReq id=0x5 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-wins 0.0.0.0> <ms-dns2 0.0.0.0> <ms-wins 0.0.0.0>]
Feb 21 12:21:43 li330-134 pppd[28147]: sent [IPCP TermAck id=0x5]
Feb 21 12:21:43 li330-134 pppd[28147]: rcvd [CCP ConfAck id=0x1 <mppe +H -M +S -L -D -C>]
Feb 21 12:21:43 li330-134 pppd[28147]: rcvd [CCP ConfReq id=0x6 <mppe +H -M +S -L -D -C>]
Feb 21 12:21:43 li330-134 pppd[28147]: sent [CCP ConfAck id=0x6 <mppe +H -M +S -L -D -C>]
Feb 21 12:21:43 li330-134 pppd[28147]: MPPE 128-bit stateless compression enabled
Feb 21 12:21:43 li330-134 pppd[28147]: sent [IPCP ConfReq id=0x1 <addr 10.1.0.1>]
Feb 21 12:21:43 li330-134 pppd[28147]: rcvd [IPCP ConfAck id=0x1 <addr 10.1.0.1>]
Feb 21 12:21:45 li330-134 pppd[28147]: rcvd [IPCP ConfReq id=0x7 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-wins 0.0.0.0> <ms-dns2 0.0.0.0> <ms-wins 0.0.0.0>]
Feb 21 12:21:45 li330-134 pppd[28147]: sent [IPCP ConfRej id=0x7 <ms-wins 0.0.0.0> <ms-wins 0.0.0.0>]
Feb 21 12:21:45 li330-134 pppd[28147]: rcvd [IPCP ConfReq id=0x8 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns2 0.0.0.0>]
Feb 21 12:21:45 li330-134 pppd[28147]: sent [IPCP ConfNak id=0x8 <addr 10.1.0.2> <ms-dns1 192.168.1.1> <ms-dns2 192.168.50.3>]
Feb 21 12:21:45 li330-134 pppd[28147]: rcvd [IPCP ConfReq id=0x9 <addr 10.1.0.2> <ms-dns1 192.168.1.1> <ms-dns2 192.168.50.3>]
Feb 21 12:21:45 li330-134 pppd[28147]: sent [IPCP ConfAck id=0x9 <addr 10.1.0.2> <ms-dns1 192.168.1.1> <ms-dns2 192.168.50.3>]
Feb 21 12:21:45 li330-134 pppd[28147]: local  IP address 10.1.0.1
Feb 21 12:21:45 li330-134 pppd[28147]: remote IP address 10.1.0.2
Feb 21 12:21:45 li330-134 pppd[28147]: pptpd-logwtmp.so ip-up ppp0 leahyhome 184.71.24.198
Feb 21 12:21:45 li330-134 pppd[28147]: Script /etc/ppp/ip-up started (pid 28156)
Feb 21 12:21:45 li330-134 pppd[28147]: rcvd [IPCP TermReq id=0xa ":\37777777645N\37777777621\000<\37777777715t\000\000\000\037"]
Feb 21 12:21:45 li330-134 pppd[28147]: IPCP terminated by peer (:M-%NM-^Q^AT_SIGN<M-Mt^AT_SIGN^AT_SIGN^AT_SIGN^_)
Feb 21 12:21:45 li330-134 pppd[28147]: pptpd-logwtmp.so ip-down ppp0
Feb 21 12:21:45 li330-134 pppd[28147]: Connect time 0.0 minutes.
Feb 21 12:21:45 li330-134 pppd[28147]: Sent 0 bytes, received 16 bytes.
Feb 21 12:21:45 li330-134 pppd[28147]: sent [IPCP TermAck id=0xa]
Feb 21 12:21:45 li330-134 pppd[28147]: Script /etc/ppp/ip-up finished (pid 28156), status = 0x0
Feb 21 12:21:45 li330-134 pppd[28147]: Script /etc/ppp/ip-down started (pid 28183)
Feb 21 12:21:45 li330-134 pppd[28147]: rcvd [LCP TermReq id=0xb ":\37777777645N\37777777621\000<\37777777715t\000\000\000\000"]
Feb 21 12:21:45 li330-134 pppd[28147]: LCP terminated by peer (:M-%NM-^Q^AT_SIGN<M-Mt^AT_SIGN^AT_SIGN^AT_SIGN^AT_SIGN)
Feb 21 12:21:45 li330-134 pppd[28147]: sent [LCP TermAck id=0xb]
Feb 21 12:21:45 li330-134 pppd[28147]: Script /etc/ppp/ip-down finished (pid 28183), status = 0x0
Feb 21 12:21:45 li330-134 pptpd[28146]: CTRL: Reaping child PPP[28147]
Feb 21 12:21:45 li330-134 pppd[28147]: Modem hangup
Feb 21 12:21:45 li330-134 pppd[28147]: Connection terminated.
Feb 21 12:21:45 li330-134 pppd[28147]: Connect time 0.0 minutes.
Feb 21 12:21:45 li330-134 pppd[28147]: Sent 4 bytes, received 16 bytes.
Feb 21 12:21:45 li330-134 pppd[28147]: Exit.
Feb 21 12:21:45 li330-134 pptpd[28146]: CTRL: Client 184.71.24.198 control connection finished
In the logs I've substituted "AT_SIGN" for the at sign, because apparently I can't post the at sign at all.