Branch Office Problems with VPN Tunnel (ISA2006)

All,

We're having a curious issue with our VPN tunnel to a Branch Office, but
only 1 of them is having the problem.

The connection will be fine, then suddenly it will stop working, but it's
still connected. There is no general connection issue as the server has an
ILO card, which is still accessable during the issue. It's as though the VPN
can't decrypt the data.

We have enabled 'tracing' on the local ISA server, and the PPP.LOG file
contains the following during the problem...

[3556] 04-08 15:28:43:800: >PPP packet received at 04/08/2008 14:28:43:800
[3556] 04-08 15:28:43:800: >Protocol = UNKNOWN, Type = UNKNOWN, Length =
0x36, Id = 0x81, Port = 18
[3556] 15:28:43:800: >E6 E9 56 81 A3 B7 AA 4F B1 E3 66 A6 F8 7D 52 85
|..V....O..f..}R.|
[3556] 15:28:43:800: >10 F4 77 C1 C3 C8 73 89 2E 23 86 B2 9D E5 0B 51
|..w...s..#.....Q|
[3556] 15:28:43:800: >25 95 FF 5E 0C 4C FF EF 2F E8 38 B2 E8 CD E9 9D
|%..^.L../.8.....|
[3556] 15:28:43:800: >26 1A 81 64 80 3A 00 00 00 00 00 00 00 00 00 00
|&..d.:..........|
[3556] 04-08 15:28:43:800:
[3556] 04-08 15:28:43:800: <PPP packet sent at 04/08/2008 14:28:43:800
[3556] 04-08 15:28:43:800: <Protocol = LCP, Type = Protocol-Reject, Length =
0x3c, Id = 0x7, Port = 18
[3556] 15:28:43:800: <C0 21 08 07 00 3A E6 E9 56 81 A3 B7 AA 4F B1 E3
|.!...:..V....O..|
[3556] 15:28:43:800: <66 A6 F8 7D 52 85 10 F4 77 C1 C3 C8 73 89 2E 23
|f..}R...w...s..#|
[3556] 15:28:43:800: <86 B2 9D E5 0B 51 25 95 FF 5E 0C 4C FF EF 2F E8
|.....Q%..^.L../.|
[3556] 15:28:43:800: <38 B2 E8 CD E9 9D 26 1A 81 64 80 3A 00 00 00 00
|8.....&..d.:....|
[3556] 04-08 15:28:43:800:
[2436] 04-08 15:28:44:393: Packet received (42 bytes) for hPort 18
[3556] 04-08 15:28:44:393: >PPP packet received at 04/08/2008 14:28:44:393
[3556] 04-08 15:28:44:393: >Protocol = UNKNOWN, Type = UNKNOWN, Length =
0x2a, Id = 0x68, Port = 18
[3556] 15:28:44:393: >9A B1 61 68 8D 36 89 8C 8D 45 96 89 92 3B C2 69
|..ah.6...E...;.i|
[3556] 15:28:44:393: >8A FB D6 81 0A C4 FC 78 E3 15 06 79 93 86 71 C9
|.......x...y..q.|
[3556] 15:28:44:393: >95 18 D2 B1 C5 12 0A 4D C1 08 00 00 00 00 00 00
|.......M........|

Bit of background info, we have our main office in Newcastle, UK, with
Branch Offices in London, UK and Copenhagen, Denmark. The problematic server
is in Copenhagen.

All 3 are ISA 2006 Standard, configured with Remote Sites using PPTP
protocol and Active Directory domain authentication.

Any ideas would be great.
.

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