Satisfactory Proxy: Which Client Connects Where?

What does SOCKS5 actually do when carrying datagrams?

The standard way to pass UDP through a proxy is the SOCKS5 protocol's UDP ASSOCIATE command. The client first establishes a TCP control connection with the proxy, requests datagram transport over that connection, and the proxy announces a relay address of its own. From then on, every datagram is sent to that address.

The critical detail: the client cannot send the datagram as-is. It must prepend a small header to each packet declaring the destination — a reserved field, a fragmentation indicator, the address type, the destination address and port. The proxy reads this header and forwards the payload to the real destination, returning the response with the same header attached.

That is why UDP support is not a checkbox but a capability requiring protocol knowledge on the client side. If a game client does not produce this header, the game traffic will not enter the tunnel no matter how capable the proxy is. SOCKS5 The difference between it and the previous version becomes clear at exactly this point; the difference between SOCKS4 and SOCKS5 goes into that distinction in detail.

Closed ports on campus and corporate networks

Most university and workplace networks limit outbound traffic to a defined set. The typical policy is: web traffic open, everything else closed. On such a network, a game session failing to establish is the expected outcome, and the cause is not your configuration but the network's rule set.

On such a network, what does a proxy solve and what does it not? What it can solve is the application layer: reaching an endpoint the launcher cannot get to, as web traffic, may be possible. What it cannot solve is the transport layer — if outbound UDP is already blocked, defining a proxy behind that block changes nothing. On what port numbers actually tell you, the proxy port numbers article helps.

The right step is the administrative one: telling the network administrator, in writing, which destination you want to reach, over which protocol and for what purpose. On corporate networks such requests are not rare and are usually resolved with a defined exception. Trying to work around network policy by technical means both violates the organisation's rules and produces no lasting solution. The general framing of the topic is access blocks on school and workplace networks the article.

There is also a verification step on the network side: separating whether the block is really on the network or on the client. Try the same connection from another device and, if possible, from another line. Proxy checker tool tells you whether the exit is alive; combining these two makes the layer of the problem clear.

There is one more intermediate picture common on restricted networks: traffic that is open but inspected. If the organisation routes outbound web traffic through its own inspection point, the connection is established, but the intervening layer re-establishes the TLS session with its own certificate. The symptom of this is a certificate warning or a validation error on the launcher side. In such an environment, adding a second proxy chain does nothing but complicate diagnosis; you first need to learn how the existing inspection point behaves.

Terms of service, server rules and anti-cheat

Using an intermediate server does not change the rules of the service you connect to. The publisher's agreement, the store platform's terms and the rules of the community server you join all remain in force. A proxy only changes the address the connection appears to come from; and that address is logged on the server side.

This page is not intended for interfering with anti-cheat mechanisms, nullifying account sanctions or circumventing regional restrictions. Technically the expectation is wrong as well: systems that check client integrity do not look at the network address, they examine the running process and in-game behaviour. Changing the address is not an input to that check.

Legitimate needs, on the other hand, are real. Verifying from a different point that a server you host is reachable from outside, inspecting the regional view of store pages, using a fixed address when leaving a corporate network. In these scenarios a proxy is a visibility and routing tool, and in that role it does not conflict with any agreement.

Authentication and access management

Proxy providers grant access in one of two ways: with a username and password, or with address authorisation. The difference between them shows up when you work from more than one device. Address authorisation is practical on fixed lines but you lose access every time your line is renewed; username–password works everywhere but is a shareable secret. The details of the methods are proxy authentication methods the article.

Another detail gains importance on the launcher side: some download clients support proxy authentication only with the basic method, and some not at all. A download failing to start on an authenticated exit is usually caused by this incompatibility, and the solution is to switch to address authorisation.

The second row in the table is the item that wastes the most time. When there is no separate setting for the game client, people assume the system setting covers it too; yet nothing changes unless the client reads the system setting. Testing this assumption by measurement is the single step that shortens diagnosis.

HTTPS tunnelling: what does CONNECT actually do?

Since almost all launcher traffic is HTTPS, knowing how the proxy carries it is useful in diagnosis. The client sends the proxy a request in the form CONNECT target.example:443 ; the proxy opens a TCP connection to the destination and, if successful, starts relaying a raw byte stream between the two sides. The TLS handshake takes place inside this tunnel, between the client and the destination.

This has two practical consequences. First, the proxy cannot read the encrypted content; it has no access to the meaning of the bytes it carries. Second, the proxy sees, and can log, which host you connect to in plain text. This distinction turns the choice of provider into a matter of trust. The details of the method are the HTTP CONNECT method article.

The third consequence concerns diagnosis: an error received while the tunnel is being established comes from the proxy, not the destination. If the proxy requires authentication, it says so before the tunnel is opened; the destination has never been reached. So when reading the error text the launcher gives, you need to distinguish whether the error originated at the proxy layer or at the destination.

A certificate warning is a separate category. On a properly working tunnel the proxy does not touch the TLS session. If you see a warning, your traffic is being decrypted and re-encrypted; outside a corporate network, that is a sign to stop and question the exit.

The post-setup verification order

A setup is trustworthy not the moment it is finished, but the moment verification is finished. The order is: first the exit's liveness, then the correctness of scope, and last the measurement of performance. Breaking this order mixes the results together.

• Verify with an independent tool that the exit responds; catch credential errors here.
• With the launcher open, check that the address shown is the exit you expect.
• Assess the game client separately; do not assume the system setting covers it.
• While downloading an update, observe that speed and continuity are acceptable.
• Take measurements before and after, with the same tool and at comparable times.

The item most often skipped in this list is the third. Seeing that the game client falls outside the proxy's scope can be disappointing, but correct information beats a false expectation: a configuration built with its scope understood also tells you where to look when something goes wrong.

One habit that makes verification easier is keeping a short record for each configuration: which exit was assigned to which software, which authentication method is used, and on what date the measurement was taken. In a setup with three separate pieces of software, this record answers the "why did I set this up this way?" question a few weeks later. The same record also provides a basis for comparison when behaviour changes after an update.

Finally, make changes one at a time. If you change the exit, the protocol and the client setting all at once, you will not know the source of any improvement; and when the problem recurs, you start over.