Заметил что в журнале реальный mtu интерфейса стал 1500, на 8-м был 576.
неплохо было бы скриншот прикрепить и лог в режиме [debag] ?
11.09.2009 [19:29:38] [DEBUG] Try open TAP device with guid: {918F2BA5-C019-4CAD-8E40-C62C0869CD07}
11.09.2009 [19:29:38] [DEBUG] Current TAP-Win32 MTU=1500
11.09.2009 [19:29:38] [DEBUG] Start sprint client, version 3.3.2a11
11.09.2009 [19:29:38] [DEBUG] Enable client
11.09.2009 [19:29:38] [INFO] Listen multicast on interface: 10.251.51.95
11.09.2009 [19:29:38] [DEBUG] Bind to mc: 227.0.0.1
11.09.2009 [19:29:38] [DEBUG] Bind to mc: 227.0.0.2
11.09.2009 [19:29:38] [DEBUG] Bind to mc: 227.0.0.3
11.09.2009 [19:29:38] [DEBUG] Request initialization from 80.81.208.66 ...
11.09.2009 [19:29:38] [INFO] Start http server at port 8080
11.09.2009 [19:29:38] [WARNING] Cann't open plugin directory, plugin load failed
11.09.2009 [19:29:43] [DEBUG] Request initialization from 80.81.208.66 ...
11.09.2009 [19:29:45] [DEBUG] Init block
11.09.2009 [19:29:45] [DEBUG] Session block
11.09.2009 [19:29:45] [DEBUG] INITED!
11.09.2009 [19:29:45] [WARNING] Unknown parameter type received: 1
11.09.2009 [19:29:45] [WARNING] Unknown parameter type received: 4
11.09.2009 [19:29:45] [WARNING] Unknown parameter type received: 5
11.09.2009 [19:29:45] [DEBUG] Set up interface
11.09.2009 [19:29:45] [DEBUG] Set up TUN-adapter ip: 10.4.78.238
11.09.2009 [19:29:45] [DEBUG] Tap ready
11.09.2009 [19:29:45] [DEBUG] Current TAP-Win32 MTU=1500
11.09.2009 [19:29:45] [INFO] Port 3128 opened for service id='0'
11.09.2009 [19:29:45] [INFO] Port 3129 opened for service id='1'
11.09.2009 [19:29:45] [INFO] Port 3130 opened for service id='2'
11.09.2009 [19:29:45] [INFO] Port 3131 opened for service id='3'
11.09.2009 [19:29:46] [DEBUG] No such connection 13336
11.09.2009 [19:29:46] [DEBUG] Sync connections
11.09.2009 [19:29:46] [DEBUG] Need system
11.09.2009 [19:29:46] [DEBUG] Send system
11.09.2009 [19:29:46] [DEBUG] Send packet
11.09.2009 [19:29:46] [DEBUG] Send packet
11.09.2009 [19:30:01] [DEBUG] Send packet
11.09.2009 [19:30:02] [DEBUG] Send packet
11.09.2009 [19:31:46] [DEBUG] Timeout awaiting response from remote side, close ALL connections.