DMVPN stays in NHRP state. 2951 router

[shallugarg6343]

hi Guys,

i have an issue with the 2951 router where the DMVPN stays in NHRP state.

IOS :c2951-universalk9-mz.SPA.152-4.M9.bin"

Router model CISCO2951/K9

I checked the configuration and everything looks fine, so just want to know if the router is hit with any kind of bug.

Someone suggested me the below link

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCun59253

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvj23301/?rfs=iqvred

[Georg Pauwen]

Hello,

can you post the configs of the hub and the spoke ?

Do you have IP connectivity between the hub and spoke ?

[shallugarg6343 · Accepted solution]

ISP was blocking port U-500.

worked with ISP and the issue was fixed.

[Vishnu Vardhan S]

Its good that it got fixed, If you have any update on how it got fixed. 

Any RCA