I setup poptop on Freesco 0.38. It works OK. I can connect from few clients running WinXP SP2.
There is one new client that can not connect. It is running WinXP SP2 as well.
The ones that can connect are behind Freesco routers

Here is part of "pptpd.log" that shows one connection then the LCP timeout
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Using interface ppp4
Connect: ppp4 <--> /dev/ttyp4
MSCHAP-v2 peer authentication succeeded for CubeAccounting
MPPE 128 bit, stateless compression enabled
found interface eth1 for proxy arp
local IP address 1.1.1.104
remote IP address 192.168.33.10
Using interface ppp5
Connect: ppp5 <--> /dev/ttyp5
LCP: timeout sending Config-Requests
Connection terminated.
Using interface ppp5
Connect: ppp5 <--> /dev/ttyp7
LCP: timeout sending Config-Requests
Connection terminated.
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And from "messages"
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Aug 28 02:29:18 - pppd[2713]: pppd 2.3.11 started by root, uid 0
Aug 28 02:29:18 - pppd[2713]: Connect: ppp5 <--> /dev/ttyp7
Aug 28 02:29:48 - pppd[2713]: LCP: timeout sending Config-Requests
Aug 28 02:29:48 - pppd[2713]: Connection terminated.
Aug 28 02:29:48 - pptpd[2712]: GRE: read(fd=6,buffer=804dd18,len=8196) from PTY failed: status = -1 error = I/O error
Aug 28 02:29:48 - pptpd[2712]: CTRL: PTY read or GRE write failed (pty,gre)=(6,7)
Aug 28 02:29:48 - pptpd[2712]: CTRL: Closing child BCrelay with pid 0
Aug 28 02:29:48 - pptpd[2712]: CTRL: Closing child ppp with pid 2713
Aug 28 02:31:48 - pptpd[2718]: CTRL: Allocating pty/tty pair
Aug 28 02:31:48 - pppd[2719]: pppd 2.3.11 started by root, uid 0
Aug 28 02:31:48 - pppd[2719]: Connect: ppp5 <--> /dev/ttyp7
Aug 28 02:32:18 - pppd[2719]: LCP: timeout sending Config-Requests
Aug 28 02:32:18 - pppd[2719]: Connection terminated.
Aug 28 02:32:18 - pptpd[2718]: GRE: read(fd=6,buffer=804dd18,len=8196) from PTY failed: status = -1 error = I/O error
Aug 28 02:32:18 - pptpd[2718]: CTRL: PTY read or GRE write failed (pty,gre)=(6,7)
Aug 28 02:32:18 - pptpd[2718]: CTRL: Closing child BCrelay with pid 0
Aug 28 02:32:18 - pptpd[2718]: CTRL: Closing child ppp with pid 2719
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Best regards,