Cisco 3750 series SNMP scans not working

While trying to add a couple of Cisco WS-C3750X-12S-S   x's in SW, half of them got pulled in, and the others were not; marked as unknowns needing http creds.

So i tested the switches from the same server, with different snmpwalk apps. Worked perfectly fine. After an onslaught of testing; including a different version of SW on another server. It seems if you have http enabled on the switch, SW cannot connect using SNMP and will time out.....even though specified in the network scan.

I even deleted the entries, and re-created network scans just with that single IP. The work around was to put the http creds, and I was able to pull the data. Just kind of weird. I am sure if i disabled http it work would.. but i technically cannot X_x

maybe their SNMP communities aren't set to public? I would check the community settings and match them to the credentials in SW

The read and write strings have an access list of a subnet where the server sits. The same config was pasted on all the switches, regarding syslogs, snmp and access lists.

Another reason why I know its public is because all other snmp apps work from that same server worked. I even tried using the RW string, no luck.

That is very peculiar. I have 2 stacks of 3750x's I can with Spiceworks using SNMP and they work just fine. I do have HTTP enabled as well. I do not use default community strings, I have Read Only strings setup and have the switches access list set to support SNMP traffic from our Spiceworks server.

Do you have custom SNMP Strings?

Are they set to Read Only?

Have you tried using the Spiceworks test feature to test just SNMP connection with the configured SNMP in version 1, 2 (or 3 if you use it)?

Its a custom Read Only and Read Write string, not the default "public".

I tried testing with SNMP v1 and v2 [never tried V3] both unsuccessful in SW, worked fine with both versions in other apps...

I was thinking it was an IOS version issue too, but than I found out they are all running the same IOS version

12.2(55)SE3-UNIVERSALK9

It could be a bug, just weird though, it only affected the ones with http enabled. Just odd the other programs get an  WS-C3750V2-48PS-S    answer immediately while SW times out. I even increased the snmp timeout as a test, no change.