ps:
1. Our network has three zones with two ad servers in each zone. There are six ad servers in total.
The jenkins server belongs to one of these zones, unlike the ad servers with the other two zones.
2. The port of [Domain controller] parameter of the ad plug-in is 389
The cause of the problem:
During the authentication process, jenkins attempted to establish a connection with the ad servers in the other two zones, but the tcp syn packet failed after four retransmissions (15 seconds) due to the network failure. Another 15 seconds later, he tries to establish a tcp connection with another server, and so on.
The solution:
After the port number of the Domain controller parameter of the ad plug-in is changed to 3268, the problem disappears.
ps:
1. Our network has three zones with two ad servers in each zone. There are six ad servers in total.
The jenkins server belongs to one of these zones, unlike the ad servers with the other two zones.
2. The port of [Domain controller] parameter of the ad plug-in is 389
The cause of the problem:
During the authentication process, jenkins attempted to establish a connection with the ad servers in the other two zones, but the tcp syn packet failed after four retransmissions (15 seconds) due to the network failure. Another 15 seconds later, he tries to establish a tcp connection with another server, and so on.
The solution:
After the port number of the Domain controller parameter of the ad plug-in is changed to 3268, the problem disappears.