This question already has an answer here:
My college uses the SonicWall firewall to block websites and unauthorized internet connections. I installed Tor 2 months ago and it worked fine. However, I'm trying to connect to the Tor Network (when I open Tor Browser in the TB folder) now and it doesn't connect. Here's the log file generated after the error says that Tor failed to establish a connection. Can someone help me in establishing a successful connection using Tor?
EDIT: Steps I am employing.
I have to log in to my SonicWall firewall using a UserName and Password. Without doing this, internet connections aren't successful.
After logging in and gaining internet access, I start the Tor Browser.
The first Question: No, I don't need a proxy to connect to the Internet. My network connection is firewalled I think because whenever I try to open a website before logging in to SonicWall, I'm redirected to a login page first.
The second Question: Although my computer does go through a firewall, after logging in, I can use the Internet except a few sites which are blocked. HTTP, HTTPS work fine on both Chrome and Firefox.
Third Question: I don't know whether my ISP blocks Tor connections. When I select no, the connection window doesn't even open. When I click Yes and try to use bridges, none of them are successful.
30-07-2014 21:25:45.132 [NOTICE] Bootstrapped 5%: Connecting to directory server. 30-07-2014 21:25:45.133 [WARN] connection_connect(): Bug: Tried to open a socket with DisableNetwork set. 30-07-2014 21:25:45.134 [WARN] Problem bootstrapping. Stuck at 5%: Connecting to directory server. (Network is unreachable [WSAENETUNREACH ]; NOROUTE; count 1; recommendation warn) 30-07-2014 21:30:04.557 [NOTICE] DisableNetwork is set. Tor will not make or accept non-control network connections. Shutting down all existing connections. 30-07-2014 21:30:04.557 [NOTICE] Pluggable transport proxy (fte exec Tor\PluggableTransports\fteproxy --managed) does not provide any needed transports and will not be launched. 30-07-2014 21:30:04.557 [NOTICE] Pluggable transport proxy (obfs2,obfs3 exec Tor\PluggableTransports\obfsproxy managed) does not provide any needed transports and will not be launched. 30-07-2014 21:30:04.557 [NOTICE] Pluggable transport proxy (flashproxy exec Tor\PluggableTransports\flashproxy-client --register :0 :9000) does not provide any needed transports and will not be launched. 30-07-2014 21:30:04.558 [NOTICE] Opening Socks listener on 127.0.0.1:9150 30-07-2014 21:30:05.388 [NOTICE] Bootstrapped 10%: Finishing handshake with directory server. 30-07-2014 21:32:06.836 [WARN] Problem bootstrapping. Stuck at 10%: Finishing handshake with directory server. (DONE; DONE; count 10; recommendation warn) 30-07-2014 21:32:06.837 [WARN] 7 connections have failed: 30-07-2014 21:32:06.837 [WARN] 7 connections died in state handshaking (TLS) with SSL state SSLv2/v3 read server hello A in HANDSHAKE