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The client's session has expired and must log in again. [43] 449 Retry With The server cannot honour the request because the user has not provided the required information. [44] 451 Redirect Used in Exchange ActiveSync when either a more efficient server is available or the server cannot access the users' mailbox. [45]
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Indicates that the destination was temporarily unavailable, so the server has queued the call until the destination is available. A server may send multiple 182 responses to update progress of the queue. [1]: §21.1.4 183 Session Progress This response may be used to send extra information for a call which is still being set up. [1]: §21.1.5
Locking a session ID to the client's IP address is a simple and effective measure as long as the attacker cannot connect to the server from the same address, but can conversely cause problems for a client if the client has multiple routes to the server (e.g. redundant internet connections) and the client's IP address undergoes Network Address ...
If there's something unusual about your sign in or recent activity, we'll ask you to go through another verification step after you've entered the correct password.
In computer science and networking in particular, a session is a time-delimited two-way link, a practical (relatively high) layer in the TCP/IP protocol enabling interactive expression and information exchange between two or more communication devices or ends – be they computers, automated systems, or live active users (see login session). A ...