EDITED 2019-02-08

`maxTxFee` is a global variable, used by both the raw transaction and wallet RPCs. It's set from `-maxtxfee`.

~listed in the global help text in init.cpp, but is only set in `WalletInit::ParameterInteraction()`. If the wallet is disabled, then `-maxtxfee` is ignored and the default is used.~

~This behaviour has existed since the mempool was changed to limit acceptance based on `maxTxFee` in https://github.com/bitcoin/bitcoin/commit/fa331db68bcc68e4c93fb45aaa30f911b0ecfe1a.~

~Short-term fix is to move the `-maxtxfee` handling to `InitParameterInteraction()` in init.cpp.~
EDIT: `maxTxFee` initiation bug fixed in #15357 

I don't think we should share this setting between the node and wallet.
CSubNet subnet;
        LookupSubNet(net.c_str(), subnet);
        if (!subnet.IsValid())
            return InitError(strprintf(_("Invalid netmask specified in -whitelist: '%s'"), net));
        connOptions.vWhitelistedRange.push_back(subnet);
    }
    connOptions.vSeedNodes = gArgs.GetArgs("-seednode");
    
    connOptions.m_use_addrman_outgoing = !gArgs.IsArgSet("-connect");
    if (!connOptions.m_use_addrman_outgoing) {
        const auto connect = gArgs.GetArgs("-connect");
        if (connect.size() != 1 || connect[0] != "0") {
            connOptions.m_specified_outgoing = connect;
        }
    }
    if (!g_connman->Start(scheduler, connOptions)) {
        return false;
    }
    
    SetRPCWarmupFinished();
    uiInterface.InitMessage(_("Done loading"));
    for (const auto& client : interfaces.chain_clients) {
        client->start(scheduler);
    }
    scheduler.scheduleEvery([]{
        g_banman->DumpBanlist();
    }, DUMP_BANS_INTERVAL * 1000);
    return true;
}