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Can't log on after changing hubs

By rkennedy ·
We are setting up a new NT server. It was working fine until we moved the server to a different hub (Server was up when we changed hubs). Now we cannot log on or see the server on the network.

We ran through the setup again with a different NICand could log in fine, but again, once we moved to a different hub, we could not log on.

Any ideas on how to fix the problem? Is the problem caused by changing hubs with the server up?

Thanks for your help.

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Can't log on after changing hubs

by philipp.rusch In reply to Can't log on after changi ...

Sounds like you have switches, not hubs ..?
We had this problem in particular with a 3com Switch (Superstack 3300) "forgetting" the mac address of an AS/400 Server after a certain time. We had to go to the managing tool at our PC to assign this port not to have the "aging" algorythm applied.
Maybe your "hubs" learn the adresses as well and dont release them when you move "online" to another hub or another port (?). HTH

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Can't log on after changing hubs

by rkennedy In reply to Can't log on after changi ...

No, we have hubs not switches. The hubs do not have a mac address.

Thanks for your suggestion.

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Can't log on after changing hubs

by RobShan In reply to Can't log on after changi ...

Are you using TCP/IP? If so is the new hub on the same sub-net as the original?

If you are using a static address, you will need to change it as appropriate. If you are using DHCP you will need to release the lease (log on locally and issue a IPCONFIG /RELEASE command followed by IPCONFIG /RENEW).

Don't overlook the obvious like faulty hub port etc. Can other PCs on the hub participate in the network?

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Can't log on after changing hubs

by rkennedy In reply to Can't log on after changi ...

We are using static addresses. We did find the problem was one of the obvious things we overlooked. We had a typo in the IP Mask. We entered 255.255.0.0 when it should have been 255.255.255.0.

Thanks for your suggestions.

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Can't log on after changing hubs

by jbrown In reply to Can't log on after changi ...

If its a dual speed hub, set it to 10MHz only. Your NIC may be having problems autonegoiating the speed.

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Can't log on after changing hubs

by rkennedy In reply to Can't log on after changi ...

Thanks for your suggestion. We tried using a fixed and a dual speed hub.

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Can't log on after changing hubs

by jbrown In reply to Can't log on after changi ...

If its a dual speed hub, set it to 10MHz only. Your NIC may be having problems autonegoiating the speed.

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Can't log on after changing hubs

by rkennedy In reply to Can't log on after changi ...
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