vpnc group secret or your login: which field takes what?
A vpnc profile asks for a group ID, a group secret and an XAuth login, and people feed the account password into the wrong box. Map each field by its role.
The first time someone hands you a vpnc profile, the credential dialog asks four things and reads as though it wants one password. It does not: a group preshared secret and an individual XAuth login are separate values with separate owners, and putting the account password into the group field yields a failure that looks like a bad password rather than a wrong box. Getting the map right is the entire task here. The protocol underneath is somebody else migration project, which is why none of this is an argument for building new IKEv1 tunnels.
Two secrets, two owners, one dialog
A group secret belongs to the gateway profile. Everyone who connects through that profile uses the same value, which is exactly why it cannot identify a person and cannot be withdrawn for one laptop without changing it for every other user of the profile. The XAuth username and password belong to the human instead, and the gateway evaluates them in a second stage after the IPsec association is already up.
That two-stage shape is what people miss. Tunnel establishment and user authentication are different exchanges with different inputs, so a client that never reaches the credential prompt has not failed on the login at all. Read the dialog as two columns rather than one: profile-wide values on the left, personal values on the right. When a connection fails, the column you filled in most recently is not automatically the column at fault.
Map the fields by role, not by label
vpnc names its directives in the project documentation, and every graphical frontend relabels them. Translate the role of each value and the labels stop mattering:
| Directive | What it carries | Who owns it |
|---|---|---|
| IPSec gateway | Address or hostname of the remote VPN endpoint | Operator |
| IPSec ID | Group identifier selecting the profile on that gateway | Operator |
| IPSec secret | Group preshared secret, not an account password | Profile, shared |
| Xauth username and password | Credentials for the per-user stage after the tunnel | Person |
A frontend showing "Username" and "Password" beside a group field is not wrong — it is the same three values under different names. What breaks is filling a box because a value fits it. A group secret pasted as the user password authenticates the profile and then fails the user stage; an account password pasted as the group secret fails earlier, before any prompt, and sends people looking at firewalls for a problem that lives in a text field.
What a group identifier is not
The word group invites a wrong reading. A group identifier here is a selector that tells the gateway which profile configuration to apply; it says nothing about directory membership, and a matching name on both sides is a coincidence until the operator confirms it. Authorization happens after XAuth succeeds, decided by whatever the gateway is configured to consult, and none of that is visible in the client dialog.
The same caution applies to the group secret. Knowing it is not an identity, and circulating one secret around a team is an operational decision with consequences the client cannot display to you.
Resolve the ambiguous instruction before connecting
Legacy handover notes often contain a line like "use the dedicated public IP". That phrase can mean the address an allowlist on the far side expects your traffic to arrive from, which is an egress property of the operator network and has nothing to do with the endpoint you type into the gateway field. Ask which of the two is meant before the value goes anywhere. Filling it backwards sends every packet to an address that never answers, and the resulting timeout reads like a blocked port.
Ask for four things through the organization verified channel: which client and protocol are supported, what endpoint to use, what identity the gateway will present, and how credentials are handed over. Keep real secrets out of screenshots, tickets and shared troubleshooting notes. Do not disable certificate checks or paste an old cipher list to make a differently configured service appear compatible, because a connection that only works by weakening verification is not the connection you were asked to build.
Keep the legacy profile honest
IKEv1 is deprecated, and RFC 9395 is the document to cite when the migration question comes up. A successful field mapping is not evidence that the protocol belongs in a new design; what it buys is a working connection while the replacement is scheduled, plus a written scope and an owner for that migration.
Then verify against the requirement rather than against the dialog. After connecting, confirm the tunnel interface holds the expected address and that an internal destination routes through it; if the original requirement named an egress address for an allowlist, confirm that address as well, since it is a different fact from the tunnel being up. A profile that authenticates correctly and routes nothing has still failed the task it was created for.