What are the topmost challenges for an IT manager after joining in a company ?

Process management

Performance management

Change management

Quality management

Project management

Financial management

Understanding the Organization Culture.

Position of current IT related issues and problems.

Handling gaps and temporary patches, fixes handed over by exiting manager.

IT Projects abandoned in mid-stage.

Budgets fixed vs spent for current year.

FIrst and Foremost challenge is very basic but most important are listed below :

• understand the current Topology
• Having the credentials for all the appliances
• Analysing the SWOT of existing setup
• evaluating the skills of IT core team
• Complete knowledge of bottle neck areas & departments
• Solution finding for existing problems
• estimate the investment and ROI

The most challenge to understand the company field deeply, map the IT activities to real value to the business and represent that to top management.  In other words to show them the return of investment of each IT Project.

Learning new processes and procedures. Understaing approvals and various committees. Knowing new boss and co workers. Adjusting mindset. Clarifying expectations. Understanding Cultural pattern. Fully understanding roles and responsibilities. Striking Balance.

Understanding the Current infrastructure for different non-related  legacy Systems

Try to meet with the team ASAP. Inform them about yourself, your background, management style, let them know you and try to gain their trust. Also learn about organization, people and policies in early stages.

Meeting new People have news Ideas goting news experiances

Analyse the current setup then convey those gaps to end user. 

Technicality isn't an issue you can collect every thing, but the most top challenge is People, you need to take your time to understand organization culture and IT services feedback from all users so you can identify your plan to make a fast good impression grant you a credit so you can implement your own management policy  

First challenge is to know current deployed IT infra topology

Get insights of the kinds of ifra and there versions involved

Based on this understanding know where are the exact IT bottlenecks, DRs and failover in case if DR been triggered.

Org processes and skillsets before planning and proposing any new process or improvement in work flow.

Understand the team members, there roles responsibilities and candidates wishfulness so that there interest to learn can increase the LOB efficiency for business.

calculating and estimating ROI based on current and planned proposed configuration for future.