problems with connectivity in the LAN - suggestions welcome

Unanswered Question
Nov 16th, 2007

many users can't access email(outlook) on one switch. They can ping the server. Users can access other applications on same switch. Users on many switches. each switch is a different vlan & all are trunked through a 6506. Other users on the same switches are o.k. can move device to another switch and it works. Rebooted pretty much everything (not the 6506). Any clues???

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JORGE RODRIGUEZ Fri, 11/16/2007 - 12:58

Hi Karen, from what you are discribing the problem seems to be unique from that one switch, few users on that one switch and outlook? check the questioned switch cpu utilization when the problem occurs , check uplinks ports as well.

When you said rebooted everything but not 6506 are you saying rebooted all the access switches connected to CORE or just that one switch?



kbutalla Fri, 11/16/2007 - 14:13

We rebooted the server and the switch and several switches we thought might be causing the problem and nothing seemed to matter.

kbutalla Fri, 11/16/2007 - 16:46

We found the problem. We had etherchannels using hsrp and the PCs in question were using one of the IPs for a vlan that had an access list preventing port 153. The other PCs were using other ports (I imagine because of the load balancing technique). We didn't need that access-list any longer and removed it and everything worked. What we don't know is why this all of a sudden occurred, as this has been this way for 2 years. Did outlook all of a sudden use this port? I don't know. But I can now go on vacation....


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