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Hai all, I configured a PPTP server in Linux and tried to connect to it from windows . It connected sucessfuly. I could also ping the hosts in other networks. ...
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  1. #1
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    Unhappy PPTP vpn error when connecting from client


    Hai all,

    I configured a PPTP server in Linux and tried to connect to it from windows . It connected sucessfuly. I could also ping the hosts in other networks. But when i tried to access a machine (say to transfer a file.) the communication breaks. Still i have the VPN connected but can't ping to any ip in that network, not even the server's IP. I could see some errors like.

    3 65 58 15 26 9f 85 5f ...
    Jul 18 03:58:10 vpn pppd[4578]: Unsupported protocol 0x702c received
    Jul 18 03:58:10 vpn pppd[4578]: sent [LCP ProtRej id=0xff 70 2c b0 b4 a8 24 1b d0 b1 12 7b 28 9f 76 e0 15 c5 ea 44 b0 56 42 b9 c6 f4 3f 43 65 58 15 26 9f ...]
    Jul 18 03:58:11 vpn pptpd[4577]: GRE: accepting packet #291
    Jul 18 03:58:11 vpn pppd[4578]: rcvd [proto=0xad] dd 77 9b a0 ad 9c 3c 9f 92 0f a1 1d 7e f6 81 bc f9 65 90 10 ed d6 33 55 2c d7 d7 ee 7a 3f 97 e5 ...
    Jul 18 03:58:11 vpn pppd[4578]: Unsupported protocol 0xad received
    Jul 18 03:58:11 vpn pppd[4578]: sent [LCP ProtRej id=0x0 00 ad dd 77 9b a0 ad 9c 3c 9f 92 0f a1 1d 7e f6 81 bc f9 65 90 10 ed d6 33 55 2c d7 d7 ee 7a 3f ...]
    Jul 18 03:58:16 vpn pptpd[4577]: GRE: accepting packet #292
    Jul 18 03:58:16 vpn pppd[4578]: rcvd [proto=0x90ff] 17 3b da 9c 53 8d 03 4c 1c fc f4 fb 19 40 04 18 af b9 74 28 be 44 bd bc 57 3a 16 c3 03 7c 3d 90 ...
    Jul 18 03:58:16 vpn pppd[4578]: Unsupported protocol 0x90ff received
    Jul 18 03:58:16 vpn pppd[4578]: sent [LCP ProtRej id=0x1 90 ff 17 3b da 9c 53 8d 03 4c 1c fc f4 fb 19 40 04 18 af b9 74 28 be 44 bd bc 57 3a 16 c3 03 7c ...]
    Jul 18 03:58:17 vpn pptpd[4577]: GRE: accepting packet #293
    Jul 18 03:58:17 vpn pppd[4578]: rcvd [proto=0xd5] a3 2a df 0b 48 8b 8b bf 88 3e 44 30 df 65 47 72 7e 9a 8a a9 94 bb cf d7 f1 ee 5c 23 e8 61 2a e9 ...
    Jul 18 03:58:17 vpn pppd[4578]: Unsupported protocol 0xd5 received
    Jul 18 03:58:17 vpn pppd[4578]: sent [LCP ProtRej id=0x2 00 d5 a3 2a df 0b 48 8b 8b bf 88 3e 44 30 df 65 47 72 7e 9a 8a a9 94 bb cf d7 f1 ee 5c 23 e8 61 ...]


    And again if i give the ping continuously it get disconnected automatically after some time. If i tried to access or run some application it disconnects right away.


    One more thing i want tio ask is Is there any way to connect more than one client from a single ip. ie for systems behind a NAT.

    Thanks,

    Vineet

  2. #2
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    Got the exact same problem.

    Debian Etch. I'm using this to replace a Mac OS X 10.3.9 server that previously had its PPTP server working fine. No changes on the server's router. I've verified that my client can connect to other PPTP servers, just not this one. Tried lowering the mtu and verifying that hardware flow control is used (see this page under "Q: I get messages saying 'Unsupported protocol (...) received'."), but that didn't change anything.

    And, tried this on another Etch system, same problem there. I made very modest changes to the default config files: Just setting up chap-secrets and setting localip and remoteip in pptpd.conf.

    Please let me know if you find a solution, this is robbing me of all my sleep.

    BTW, do you have another problem I do, namely that often the first connection attempt doesn't authenticate? Subsequent attempts authenticate fine, and then I run into the above problem.

    Steve
    Last edited by Scramblejams; 07-19-2007 at 07:22 PM. Reason: Added info.

  3. #3
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    Fixed it, I think.

    As I said, I'm using Debian Etch. The pptpd version on there is 1.3.0. I found this thread, though, which made me think I ought to either upgrade or downgrade. So I built pptpd 1.3.4 from source (grabbing 1.3.4's source packages from unstable and following these instrucs), and it looks like it's resolved the issue.

    Doing a big file transfer now to confirm, but I never got so much as a 2 meg file through with 1.3.0, so it looks good so far.

    Update: This link says it all. In my opinion that really ought to be marked severe. Wish I'd found that last night.

    Anyway, good luck!

    Steve

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