For some reason, if you put the value
loginQueueConcurrentPlayers=5;
more than 5, the server cannot start due to the fact that at startup the server fps will fall below one in the first seconds

Maybe related to T175043?, that being from client perspective and this one from server perpective? @Norealname, do you know what error code shows to the player. Is it error 0x00040031?

In T175275#2496140, @Nolhek wrote:

Maybe related to T175043?, that being from client perspective and this one from server perpective? @Norealname, do you know what error code shows to the player. Is it error 0x00040031?

This is another 0x00040060
No player can queue, so I think it's a server side issue

@Geez
verifySignatures = 0;
breaks the queue, tested on a completely vanilla server

In T175275#2495588, @Norealname wrote:

For some reason, if you put the value
loginQueueConcurrentPlayers=5;
more than 5, the server cannot start due to the fact that at startup the server fps will fall below one in the first seconds

Hello Norealname.
There needs to be some reasonable number in this parameter. Putting more than 5 will definitely affect performance negatively.

In T175275#2498594, @Norealname wrote:

@Geez
verifySignatures = 0;
breaks the queue, tested on a completely vanilla server

Also we are aware of this issue and it is scheduled for a fix. However putting zero is not recommended by us generally as this allows people with outdated mods/mods not installed on the server/without mods to connect to the server. which can cause issues.

In T175275#2498772, @Geez wrote:

In T175275#2498594, @Norealname wrote:

@Geez
verifySignatures = 0;
breaks the queue, tested on a completely vanilla server

Also we are aware of this issue and it is scheduled for a fix. However putting zero is not recommended by us generally as this allows people with outdated mods/mods not installed on the server/without mods to connect to the server. which can cause issues.

This also allows you not to worry that any mod will stop the server after updating.